diff --git a/src/Sonarr.Http/REST/RestController.cs b/src/Sonarr.Http/REST/RestController.cs
index 7632d8b7f..e08790a45 100644
--- a/src/Sonarr.Http/REST/RestController.cs
+++ b/src/Sonarr.Http/REST/RestController.cs
@@ -70,11 +70,15 @@ public override void OnActionExecuting(ActionExecutingContext context)
             var skipValidate = skipAttribute?.Skip ?? false;
             var skipShared = skipAttribute?.SkipShared ?? false;
 
-            if (Request.Method == "POST" || Request.Method == "PUT")
+            if (Request.Method is "POST" or "PUT")
             {
-                var resourceArgs = context.ActionArguments.Values.Where(x => x.GetType() == typeof(TResource))
-                    .Select(x => x as TResource)
-                    .ToList();
+                var resourceArgs = context.ActionArguments.Values
+                    .SelectMany(x => x switch
+                    {
+                        TResource single => new[] { single },
+                        IEnumerable<TResource> multiple => multiple,
+                        _ => Enumerable.Empty<TResource>()
+                    });
 
                 foreach (var resource in resourceArgs)
                 {