diff --git a/Shoko.Server/API/v3/Controllers/FilterController.cs b/Shoko.Server/API/v3/Controllers/FilterController.cs
index 50e8bda73..27866c3c0 100644
--- a/Shoko.Server/API/v3/Controllers/FilterController.cs
+++ b/Shoko.Server/API/v3/Controllers/FilterController.cs
@@ -82,12 +82,22 @@ [FromQuery] [Range(1, int.MaxValue)] int page = 1, [FromQuery] bool withConditio
     [HttpPost]
     public ActionResult<Filter> AddNewFilter(Filter.Input.CreateOrUpdateFilterBody body)
     {
-        var filterPreset = new FilterPreset { FilterType = GroupFilterType.UserDefined };
-        var filter = _factory.MergeWithExisting(body, filterPreset, ModelState);
-        if (!ModelState.IsValid)
-            return ValidationProblem(ModelState);
+        try
+        {
+            var filterPreset = new FilterPreset
+            {
+                FilterType = GroupFilterType.UserDefined
+            };
+            var filter = _factory.MergeWithExisting(body, filterPreset, ModelState);
+            if (!ModelState.IsValid)
+                return ValidationProblem(ModelState);
 
-        return filter;
+            return filter;
+        }
+        catch (ArgumentException e)
+        {
+            return ValidationProblem(e.Message, "Expression");
+        }
     }
 
     /// <summary>
@@ -222,16 +232,23 @@ public ActionResult<Filter> PatchFilter([FromRoute] int filterID, JsonPatchDocum
         if (filterPreset == null)
             return NotFound(FilterNotFound);
 
-        var body = _factory.CreateOrUpdateFilterBody(filterPreset);
-        document.ApplyTo(body, ModelState);
-        if (!ModelState.IsValid)
-            return ValidationProblem(ModelState);
-
-        var filter = _factory.MergeWithExisting(body, filterPreset, ModelState);
-        if (!ModelState.IsValid)
-            return ValidationProblem(ModelState);
-
-        return filter;
+        try
+        {
+            var body = _factory.CreateOrUpdateFilterBody(filterPreset);
+            document.ApplyTo(body, ModelState);
+            if (!ModelState.IsValid)
+                return ValidationProblem(ModelState);
+
+            var filter = _factory.MergeWithExisting(body, filterPreset, ModelState);
+            if (!ModelState.IsValid)
+                return ValidationProblem(ModelState);
+
+            return filter;
+        }
+        catch (ArgumentException e)
+        {
+            return ValidationProblem(e.Message, "Expression");
+        }
     }
 
     /// <summary>
@@ -248,11 +265,18 @@ public ActionResult<Filter> PutFilter([FromRoute] int filterID, Filter.Input.Cre
         if (filterPreset == null)
             return NotFound(FilterNotFound);
 
-        var filter = _factory.MergeWithExisting(body, filterPreset, ModelState);
-        if (!ModelState.IsValid)
-            return ValidationProblem(ModelState);
+        try
+        {
+            var filter = _factory.MergeWithExisting(body, filterPreset, ModelState);
+            if (!ModelState.IsValid)
+                return ValidationProblem(ModelState);
 
-        return filter;
+            return filter;
+        }
+        catch (ArgumentException e)
+        {
+            return ValidationProblem(e.Message, "Expression");
+        }
     }
 
     /// <summary>