diff --git a/src/NzbDrone.Core.Test/ParserTests/ParserFixture.cs b/src/NzbDrone.Core.Test/ParserTests/ParserFixture.cs
index 7ca7a4c70..effb96cca 100644
--- a/src/NzbDrone.Core.Test/ParserTests/ParserFixture.cs
+++ b/src/NzbDrone.Core.Test/ParserTests/ParserFixture.cs
@@ -162,6 +162,7 @@ namespace NzbDrone.Core.Test.ParserTests
             parsed.ImdbId.Should().Be(imdb);
         }
 
+        [TestCase("asfd", null)]
         [TestCase("123", "tt0000123")]
         [TestCase("1234567", "tt1234567")]
         [TestCase("tt1234567", "tt1234567")]
diff --git a/src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs b/src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs
index ca7189684..b50c07800 100644
--- a/src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs
+++ b/src/NzbDrone.Core/MetadataSource/SkyHook/SkyHookProxy.cs
@@ -125,6 +125,13 @@ namespace NzbDrone.Core.MetadataSource.SkyHook
 
         public Movie GetMovieByImdbId(string imdbId)
         {
+            imdbId = Parser.Parser.NormalizeImdbId(imdbId);
+
+            if (imdbId == null)
+            {
+                return null;
+            }
+
             var httpRequest = _radarrMetadata.Create()
                                              .SetSegment("route", "movie/imdb")
                                              .Resource(imdbId.ToString())
diff --git a/src/NzbDrone.Core/Parser/Parser.cs b/src/NzbDrone.Core/Parser/Parser.cs
index e659b9e6b..2986c5dfc 100644
--- a/src/NzbDrone.Core/Parser/Parser.cs
+++ b/src/NzbDrone.Core/Parser/Parser.cs
@@ -357,6 +357,13 @@ namespace NzbDrone.Core.Parser
 
         public static string NormalizeImdbId(string imdbId)
         {
+            var imdbRegex = new Regex(@"^(\d{1,10}|(tt)\d{1,10})$");
+
+            if (!imdbRegex.IsMatch(imdbId))
+            {
+                return null;
+            }
+
             if (imdbId.Length > 2)
             {
                 imdbId = imdbId.Replace("tt", "").PadLeft(7, '0');