diff --git a/src/NzbDrone.Mono/DiskProvider.cs b/src/NzbDrone.Mono/DiskProvider.cs
index f09ae650e..cfbaa98c4 100644
--- a/src/NzbDrone.Mono/DiskProvider.cs
+++ b/src/NzbDrone.Mono/DiskProvider.cs
@@ -62,6 +62,12 @@ public override void SetPermissions(string path, string mask, string user, strin
                 throw new LinuxPermissionsException("Error setting file permissions: " + error);
             }
 
+            if (String.IsNullOrWhiteSpace(user) || String.IsNullOrWhiteSpace(group))
+            {
+                Logger.Trace("User or Group for chown not configured, skipping chown.");
+                return;
+            }
+
             uint userId;
             uint groupId;