Closes #560
@ -1443,7 +1443,7 @@ namespace NzbDrone.Core.Indexers.Definitions
queryCollection.Add("nm", searchString);
}
if (categories.Length > 0)
if (categories != null && categories.Length > 0)
{
queryCollection.Add("f", string.Join(",", Capabilities.Categories.MapTorznabCapsToTrackers(categories)));