diff --git a/src/Radarr.Api.V3/AutoTagging/AutoTaggingController.cs b/src/Radarr.Api.V3/AutoTagging/AutoTaggingController.cs
index 6b08692c2..981382c0a 100644
--- a/src/Radarr.Api.V3/AutoTagging/AutoTaggingController.cs
+++ b/src/Radarr.Api.V3/AutoTagging/AutoTaggingController.cs
@@ -1,10 +1,12 @@
 using System.Collections.Generic;
 using System.Linq;
 using FluentValidation;
+using FluentValidation.Results;
 using Microsoft.AspNetCore.Mvc;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Core.AutoTagging;
 using NzbDrone.Core.AutoTagging.Specifications;
+using NzbDrone.Core.Validation;
 using Radarr.Http;
 using Radarr.Http.REST;
 using Radarr.Http.REST.Attributes;
@@ -52,6 +54,9 @@ namespace Radarr.Api.V3.AutoTagging
         public ActionResult<AutoTaggingResource> Create(AutoTaggingResource autoTagResource)
         {
             var model = autoTagResource.ToModel(_specifications);
+
+            Validate(model);
+
             return Created(_autoTaggingService.Insert(model).Id);
         }
 
@@ -60,6 +65,9 @@ namespace Radarr.Api.V3.AutoTagging
         public ActionResult<AutoTaggingResource> Update(AutoTaggingResource resource)
         {
             var model = resource.ToModel(_specifications);
+
+            Validate(model);
+
             _autoTaggingService.Update(model);
 
             return Accepted(model.Id);
@@ -85,5 +93,23 @@ namespace Radarr.Api.V3.AutoTagging
 
             return schema;
         }
+
+        private void Validate(AutoTag definition)
+        {
+            foreach (var validationResult in definition.Specifications.Select(spec => spec.Validate()))
+            {
+                VerifyValidationResult(validationResult);
+            }
+        }
+
+        private void VerifyValidationResult(ValidationResult validationResult)
+        {
+            var result = new NzbDroneValidationResult(validationResult.Errors);
+
+            if (!result.IsValid)
+            {
+                throw new ValidationException(result.Errors);
+            }
+        }
     }
 }