diff --git a/.config/dotnet-tools.json b/.config/dotnet-tools.json
index 29bb6bf..c3a0dc9 100644
--- a/.config/dotnet-tools.json
+++ b/.config/dotnet-tools.json
@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "xamlstyler.console": {
-      "version": "3.2003.9",
+      "version": "3.2008.4",
       "commands": [
         "xstyler"
       ]
diff --git a/DiscordChatExporter.Core/Discord/Data/Attachment.cs b/DiscordChatExporter.Core/Discord/Data/Attachment.cs
index 74a70f7..2b52cc6 100644
--- a/DiscordChatExporter.Core/Discord/Data/Attachment.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Attachment.cs
@@ -58,11 +58,11 @@ namespace DiscordChatExporter.Core.Discord.Data
     {
         public static Attachment Parse(JsonElement json)
         {
-            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
-            var url = json.GetProperty("url").GetString();
+            var id = json.GetProperty("id").GetNonWhiteSpaceString().Pipe(Snowflake.Parse);
+            var url = json.GetProperty("url").GetNonWhiteSpaceString();
             var width = json.GetPropertyOrNull("width")?.GetInt32();
             var height = json.GetPropertyOrNull("height")?.GetInt32();
-            var fileName = json.GetProperty("filename").GetString();
+            var fileName = json.GetProperty("filename").GetNonWhiteSpaceString();
             var fileSize = json.GetProperty("size").GetInt64().Pipe(FileSize.FromBytes);
 
             return new Attachment(id, url, fileName, width, height, fileSize);
diff --git a/DiscordChatExporter.Core/Discord/Data/Channel.cs b/DiscordChatExporter.Core/Discord/Data/Channel.cs
index 5978df2..a6288c3 100644
--- a/DiscordChatExporter.Core/Discord/Data/Channel.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Channel.cs
@@ -74,14 +74,14 @@ namespace DiscordChatExporter.Core.Discord.Data
 
         public static Channel Parse(JsonElement json, ChannelCategory? category = null, int? position = null)
         {
-            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
-            var guildId = json.GetPropertyOrNull("guild_id")?.GetString().Pipe(Snowflake.Parse);
-            var topic = json.GetPropertyOrNull("topic")?.GetString();
+            var id = json.GetProperty("id").GetNonWhiteSpaceString().Pipe(Snowflake.Parse);
+            var guildId = json.GetPropertyOrNull("guild_id")?.GetNonWhiteSpaceString().Pipe(Snowflake.Parse);
+            var topic = json.GetPropertyOrNull("topic")?.GetStringOrNull();
             var kind = (ChannelKind) json.GetProperty("type").GetInt32();
 
             var name =
                 // Guild channel
-                json.GetPropertyOrNull("name")?.GetString() ??
+                json.GetPropertyOrNull("name")?.GetStringOrNull() ??
                 // DM channel
                 json.GetPropertyOrNull("recipients")?.EnumerateArray().Select(User.Parse).Select(u => u.Name).JoinToString(", ") ??
                 // Fallback
diff --git a/DiscordChatExporter.Core/Discord/Data/ChannelCategory.cs b/DiscordChatExporter.Core/Discord/Data/ChannelCategory.cs
index 159adc2..df1b08a 100644
--- a/DiscordChatExporter.Core/Discord/Data/ChannelCategory.cs
+++ b/DiscordChatExporter.Core/Discord/Data/ChannelCategory.cs
@@ -31,10 +31,10 @@ namespace DiscordChatExporter.Core.Discord.Data
 
         public static ChannelCategory Parse(JsonElement json, int? position = null)
         {
-            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
+            var id = json.GetProperty("id").GetNonWhiteSpaceString().Pipe(Snowflake.Parse);
 
             var name =
-                json.GetPropertyOrNull("name")?.GetString() ??
+                json.GetPropertyOrNull("name")?.GetStringOrNull() ??
                 id.ToString();
 
             return new ChannelCategory(
diff --git a/DiscordChatExporter.Core/Discord/Data/Embeds/Embed.cs b/DiscordChatExporter.Core/Discord/Data/Embeds/Embed.cs
index 510d5c5..38189cb 100644
--- a/DiscordChatExporter.Core/Discord/Data/Embeds/Embed.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Embeds/Embed.cs
@@ -70,11 +70,11 @@ namespace DiscordChatExporter.Core.Discord.Data.Embeds
     {
         public static Embed Parse(JsonElement json)
         {
-            var title = json.GetPropertyOrNull("title")?.GetString();
-            var url = json.GetPropertyOrNull("url")?.GetString();
+            var title = json.GetPropertyOrNull("title")?.GetStringOrNull();
+            var url = json.GetPropertyOrNull("url")?.GetStringOrNull();
             var timestamp = json.GetPropertyOrNull("timestamp")?.GetDateTimeOffset();
             var color = json.GetPropertyOrNull("color")?.GetInt32().Pipe(System.Drawing.Color.FromArgb).ResetAlpha();
-            var description = json.GetPropertyOrNull("description")?.GetString();
+            var description = json.GetPropertyOrNull("description")?.GetStringOrNull();
 
             var author = json.GetPropertyOrNull("author")?.Pipe(EmbedAuthor.Parse);
             var thumbnail = json.GetPropertyOrNull("thumbnail")?.Pipe(EmbedImage.Parse);
diff --git a/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedAuthor.cs b/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedAuthor.cs
index c420a99..75f192c 100644
--- a/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedAuthor.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedAuthor.cs
@@ -31,10 +31,10 @@ namespace DiscordChatExporter.Core.Discord.Data.Embeds
     {
         public static EmbedAuthor Parse(JsonElement json)
         {
-            var name = json.GetPropertyOrNull("name")?.GetString();
-            var url = json.GetPropertyOrNull("url")?.GetString();
-            var iconUrl = json.GetPropertyOrNull("icon_url")?.GetString();
-            var iconProxyUrl = json.GetPropertyOrNull("proxy_icon_url")?.GetString();
+            var name = json.GetPropertyOrNull("name")?.GetStringOrNull();
+            var url = json.GetPropertyOrNull("url")?.GetStringOrNull();
+            var iconUrl = json.GetPropertyOrNull("icon_url")?.GetStringOrNull();
+            var iconProxyUrl = json.GetPropertyOrNull("proxy_icon_url")?.GetStringOrNull();
 
             return new EmbedAuthor(name, url, iconUrl, iconProxyUrl);
         }
diff --git a/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedField.cs b/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedField.cs
index 1e21c64..acfe240 100644
--- a/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedField.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedField.cs
@@ -1,5 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Text.Json;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
 
 namespace DiscordChatExporter.Core.Discord.Data.Embeds
@@ -28,8 +29,8 @@ namespace DiscordChatExporter.Core.Discord.Data.Embeds
     {
         public static EmbedField Parse(JsonElement json)
         {
-            var name = json.GetProperty("name").GetString();
-            var value = json.GetProperty("value").GetString();
+            var name = json.GetProperty("name").GetNonWhiteSpaceString();
+            var value = json.GetProperty("value").GetNonWhiteSpaceString();
             var isInline = json.GetPropertyOrNull("inline")?.GetBoolean() ?? false;
 
             return new EmbedField(name, value, isInline);
diff --git a/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedFooter.cs b/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedFooter.cs
index 931f15e..5b2343d 100644
--- a/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedFooter.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedFooter.cs
@@ -1,5 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Text.Json;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
 
 namespace DiscordChatExporter.Core.Discord.Data.Embeds
@@ -28,9 +29,9 @@ namespace DiscordChatExporter.Core.Discord.Data.Embeds
     {
         public static EmbedFooter Parse(JsonElement json)
         {
-            var text = json.GetProperty("text").GetString();
-            var iconUrl = json.GetPropertyOrNull("icon_url")?.GetString();
-            var iconProxyUrl = json.GetPropertyOrNull("proxy_icon_url")?.GetString();
+            var text = json.GetProperty("text").GetNonWhiteSpaceString();
+            var iconUrl = json.GetPropertyOrNull("icon_url")?.GetStringOrNull();
+            var iconProxyUrl = json.GetPropertyOrNull("proxy_icon_url")?.GetStringOrNull();
 
             return new EmbedFooter(text, iconUrl, iconProxyUrl);
         }
diff --git a/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedImage.cs b/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedImage.cs
index 6f0569c..b1ebcff 100644
--- a/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedImage.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Embeds/EmbedImage.cs
@@ -27,8 +27,8 @@ namespace DiscordChatExporter.Core.Discord.Data.Embeds
     {
         public static EmbedImage Parse(JsonElement json)
         {
-            var url = json.GetPropertyOrNull("url")?.GetString();
-            var proxyUrl = json.GetPropertyOrNull("proxy_url")?.GetString();
+            var url = json.GetPropertyOrNull("url")?.GetStringOrNull();
+            var proxyUrl = json.GetPropertyOrNull("proxy_url")?.GetStringOrNull();
             var width = json.GetPropertyOrNull("width")?.GetInt32();
             var height = json.GetPropertyOrNull("height")?.GetInt32();
 
diff --git a/DiscordChatExporter.Core/Discord/Data/Emoji.cs b/DiscordChatExporter.Core/Discord/Data/Emoji.cs
index e42da43..15eaf4f 100644
--- a/DiscordChatExporter.Core/Discord/Data/Emoji.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Emoji.cs
@@ -64,8 +64,8 @@ namespace DiscordChatExporter.Core.Discord.Data
 
         public static Emoji Parse(JsonElement json)
         {
-            var id = json.GetPropertyOrNull("id")?.GetString();
-            var name = json.GetProperty("name").GetString();
+            var id = json.GetPropertyOrNull("id")?.GetNonWhiteSpaceString();
+            var name = json.GetProperty("name").GetNonWhiteSpaceString();
             var isAnimated = json.GetPropertyOrNull("animated")?.GetBoolean() ?? false;
 
             var imageUrl = GetImageUrl(id, name, isAnimated);
diff --git a/DiscordChatExporter.Core/Discord/Data/Guild.cs b/DiscordChatExporter.Core/Discord/Data/Guild.cs
index 90538b7..840e8f3 100644
--- a/DiscordChatExporter.Core/Discord/Data/Guild.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Guild.cs
@@ -2,6 +2,7 @@
 using System.Text.Json;
 using DiscordChatExporter.Core.Discord.Data.Common;
 using DiscordChatExporter.Core.Utils.Extensions;
+using JsonExtensions.Reading;
 
 namespace DiscordChatExporter.Core.Discord.Data
 {
@@ -41,9 +42,9 @@ namespace DiscordChatExporter.Core.Discord.Data
 
         public static Guild Parse(JsonElement json)
         {
-            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
-            var name = json.GetProperty("name").GetString();
-            var iconHash = json.GetProperty("icon").GetString();
+            var id = json.GetProperty("id").GetNonWhiteSpaceString().Pipe(Snowflake.Parse);
+            var name = json.GetProperty("name").GetNonWhiteSpaceString();
+            var iconHash = json.GetPropertyOrNull("icon")?.GetStringOrNull();
 
             var iconUrl = !string.IsNullOrWhiteSpace(iconHash)
                 ? GetIconUrl(id, iconHash)
diff --git a/DiscordChatExporter.Core/Discord/Data/Member.cs b/DiscordChatExporter.Core/Discord/Data/Member.cs
index d98b977..9711d62 100644
--- a/DiscordChatExporter.Core/Discord/Data/Member.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Member.cs
@@ -42,10 +42,10 @@ namespace DiscordChatExporter.Core.Discord.Data
         public static Member Parse(JsonElement json)
         {
             var user = json.GetProperty("user").Pipe(User.Parse);
-            var nick = json.GetPropertyOrNull("nick")?.GetString();
+            var nick = json.GetPropertyOrNull("nick")?.GetStringOrNull();
 
             var roleIds =
-                json.GetPropertyOrNull("roles")?.EnumerateArray().Select(j => j.GetString()).Select(Snowflake.Parse).ToArray() ??
+                json.GetPropertyOrNull("roles")?.EnumerateArray().Select(j => j.GetNonWhiteSpaceString()).Select(Snowflake.Parse).ToArray() ??
                 Array.Empty<Snowflake>();
 
             return new Member(
diff --git a/DiscordChatExporter.Core/Discord/Data/Message.cs b/DiscordChatExporter.Core/Discord/Data/Message.cs
index 10adbf7..f03ac3a 100644
--- a/DiscordChatExporter.Core/Discord/Data/Message.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Message.cs
@@ -81,7 +81,7 @@ namespace DiscordChatExporter.Core.Discord.Data
     {
         public static Message Parse(JsonElement json)
         {
-            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
+            var id = json.GetProperty("id").GetNonWhiteSpaceString().Pipe(Snowflake.Parse);
             var author = json.GetProperty("author").Pipe(User.Parse);
             var timestamp = json.GetProperty("timestamp").GetDateTimeOffset();
             var editedTimestamp = json.GetPropertyOrNull("edited_timestamp")?.GetDateTimeOffset();
@@ -101,7 +101,7 @@ namespace DiscordChatExporter.Core.Discord.Data
                 MessageKind.ChannelIconChange => "Changed the channel icon.",
                 MessageKind.ChannelPinnedMessage => "Pinned a message.",
                 MessageKind.GuildMemberJoin => "Joined the server.",
-                _ => json.GetPropertyOrNull("content")?.GetString() ?? ""
+                _ => json.GetPropertyOrNull("content")?.GetStringOrNull() ?? ""
             };
 
             var attachments =
diff --git a/DiscordChatExporter.Core/Discord/Data/MessageReference.cs b/DiscordChatExporter.Core/Discord/Data/MessageReference.cs
index a2160e4..419070d 100644
--- a/DiscordChatExporter.Core/Discord/Data/MessageReference.cs
+++ b/DiscordChatExporter.Core/Discord/Data/MessageReference.cs
@@ -29,9 +29,9 @@ namespace DiscordChatExporter.Core.Discord.Data
     {
         public static MessageReference Parse(JsonElement json)
         {
-            var messageId = json.GetPropertyOrNull("message_id")?.GetString().Pipe(Snowflake.Parse);
-            var channelId = json.GetPropertyOrNull("channel_id")?.GetString().Pipe(Snowflake.Parse);
-            var guildId = json.GetPropertyOrNull("guild_id")?.GetString().Pipe(Snowflake.Parse);
+            var messageId = json.GetPropertyOrNull("message_id")?.GetStringOrNull()?.Pipe(Snowflake.Parse);
+            var channelId = json.GetPropertyOrNull("channel_id")?.GetStringOrNull()?.Pipe(Snowflake.Parse);
+            var guildId = json.GetPropertyOrNull("guild_id")?.GetStringOrNull()?.Pipe(Snowflake.Parse);
 
             return new MessageReference(messageId, channelId, guildId);
         }
diff --git a/DiscordChatExporter.Core/Discord/Data/Role.cs b/DiscordChatExporter.Core/Discord/Data/Role.cs
index f9e2235..7b75554 100644
--- a/DiscordChatExporter.Core/Discord/Data/Role.cs
+++ b/DiscordChatExporter.Core/Discord/Data/Role.cs
@@ -38,8 +38,8 @@ namespace DiscordChatExporter.Core.Discord.Data
     {
         public static Role Parse(JsonElement json)
         {
-            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
-            var name = json.GetProperty("name").GetString();
+            var id = json.GetProperty("id").GetNonWhiteSpaceString().Pipe(Snowflake.Parse);
+            var name = json.GetProperty("name").GetNonWhiteSpaceString();
             var position = json.GetProperty("position").GetInt32();
 
             var color = json
diff --git a/DiscordChatExporter.Core/Discord/Data/User.cs b/DiscordChatExporter.Core/Discord/Data/User.cs
index a446be9..2b1fc09 100644
--- a/DiscordChatExporter.Core/Discord/Data/User.cs
+++ b/DiscordChatExporter.Core/Discord/Data/User.cs
@@ -58,11 +58,11 @@ namespace DiscordChatExporter.Core.Discord.Data
 
         public static User Parse(JsonElement json)
         {
-            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
+            var id = json.GetProperty("id").GetNonWhiteSpaceString().Pipe(Snowflake.Parse);
             var isBot = json.GetPropertyOrNull("bot")?.GetBoolean() ?? false;
-            var discriminator = json.GetProperty("discriminator").GetString().Pipe(int.Parse);
-            var name = json.GetProperty("username").GetString();
-            var avatarHash = json.GetProperty("avatar").GetString();
+            var discriminator = json.GetProperty("discriminator").GetNonWhiteSpaceString().Pipe(int.Parse);
+            var name = json.GetProperty("username").GetNonWhiteSpaceString();
+            var avatarHash = json.GetPropertyOrNull("avatar")?.GetStringOrNull();
 
             var avatarUrl = !string.IsNullOrWhiteSpace(avatarHash)
                 ? GetAvatarUrl(id, avatarHash)
diff --git a/DiscordChatExporter.Core/Discord/DiscordClient.cs b/DiscordChatExporter.Core/Discord/DiscordClient.cs
index a0fa38c..87e3c1e 100644
--- a/DiscordChatExporter.Core/Discord/DiscordClient.cs
+++ b/DiscordChatExporter.Core/Discord/DiscordClient.cs
@@ -130,7 +130,7 @@ namespace DiscordChatExporter.Core.Discord
                 var responseOrdered = response
                     .EnumerateArray()
                     .OrderBy(j => j.GetProperty("position").GetInt32())
-                    .ThenBy(j => Snowflake.Parse(j.GetProperty("id").GetString()))
+                    .ThenBy(j => j.GetProperty("id").GetNonWhiteSpaceString().Pipe(Snowflake.Parse))
                     .ToArray();
 
                 var categories = responseOrdered
@@ -142,7 +142,7 @@ namespace DiscordChatExporter.Core.Discord
 
                 foreach (var channelJson in responseOrdered)
                 {
-                    var parentId = channelJson.GetPropertyOrNull("parent_id")?.GetString();
+                    var parentId = channelJson.GetPropertyOrNull("parent_id")?.GetStringOrNull();
 
                     var category = !string.IsNullOrWhiteSpace(parentId)
                         ? categories.GetValueOrDefault(parentId)
@@ -205,7 +205,7 @@ namespace DiscordChatExporter.Core.Discord
         {
             var response = await GetJsonResponseAsync($"channels/{channelId}", cancellationToken);
 
-            var parentId = response.GetPropertyOrNull("parent_id")?.GetString().Pipe(Snowflake.Parse);
+            var parentId = response.GetPropertyOrNull("parent_id")?.GetStringOrNull()?.Pipe(Snowflake.Parse);
 
             var category = parentId is not null
                 ? await GetChannelCategoryAsync(parentId.Value, cancellationToken)
diff --git a/DiscordChatExporter.Core/Utils/Extensions/JsonExtensions.cs b/DiscordChatExporter.Core/Utils/Extensions/JsonExtensions.cs
new file mode 100644
index 0000000..61fcfff
--- /dev/null
+++ b/DiscordChatExporter.Core/Utils/Extensions/JsonExtensions.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Text.Json;
+
+namespace DiscordChatExporter.Core.Utils.Extensions
+{
+    public static class JsonExtensions
+    {
+        public static string GetNonWhiteSpaceString(this JsonElement json)
+        {
+            if (json.ValueKind != JsonValueKind.String)
+                throw new FormatException();
+
+            var value = json.GetString();
+            if (string.IsNullOrWhiteSpace(value))
+                throw new FormatException();
+
+            return value;
+        }
+    }
+}
\ No newline at end of file
diff --git a/DiscordChatExporter.Core/Utils/Http.cs b/DiscordChatExporter.Core/Utils/Http.cs
index fec0cbf..f505fe1 100644
--- a/DiscordChatExporter.Core/Utils/Http.cs
+++ b/DiscordChatExporter.Core/Utils/Http.cs
@@ -33,7 +33,7 @@ namespace DiscordChatExporter.Core.Utils
                             // on the very first request.
                             if (i > 3)
                             {
-                                var retryAfterDelay = result.Result.Headers.RetryAfter.Delta;
+                                var retryAfterDelay = result.Result.Headers.RetryAfter?.Delta;
                                 if (retryAfterDelay is not null)
                                     return retryAfterDelay.Value + TimeSpan.FromSeconds(1); // margin just in case
                             }
diff --git a/DiscordChatExporter.Gui/DiscordChatExporter.Gui.csproj b/DiscordChatExporter.Gui/DiscordChatExporter.Gui.csproj
index f8094c6..c5e05d4 100644
--- a/DiscordChatExporter.Gui/DiscordChatExporter.Gui.csproj
+++ b/DiscordChatExporter.Gui/DiscordChatExporter.Gui.csproj
@@ -1,6 +1,7 @@
-<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
+    <TargetFramework>$(TargetFramework)-windows</TargetFramework>
     <OutputType>WinExe</OutputType>
     <AssemblyName>DiscordChatExporter</AssemblyName>
     <UseWPF>true</UseWPF>
@@ -34,7 +35,7 @@
 
   <Target Name="Format XAML" AfterTargets="BeforeBuild">
     <Exec Command="dotnet tool restore" />
-    <Exec Command="dotnet xstyler -r -d ." />
+    <Exec Command="dotnet xstyler -r -d $(MSBuildProjectDirectory)" />
   </Target>
 
 </Project>
\ No newline at end of file