diff --git a/src/NzbDrone.Common/Extensions/PathExtensions.cs b/src/NzbDrone.Common/Extensions/PathExtensions.cs
index f2d82f10e..b7af090bc 100644
--- a/src/NzbDrone.Common/Extensions/PathExtensions.cs
+++ b/src/NzbDrone.Common/Extensions/PathExtensions.cs
@@ -158,6 +158,11 @@ namespace NzbDrone.Common.Extensions
 
         public static bool ContainsInvalidPathChars(this string text)
         {
+            if (text.IsNullOrWhiteSpace())
+            {
+                throw new ArgumentNullException("text");
+            }
+
             return text.IndexOfAny(Path.GetInvalidPathChars()) >= 0;
         }