diff --git a/src/wp8/SocialSharing.cs b/src/wp8/SocialSharing.cs
index 1a165127..9d63b2f4 100644
--- a/src/wp8/SocialSharing.cs
+++ b/src/wp8/SocialSharing.cs
@@ -26,7 +26,7 @@ public void share(string jsonArgs)
             var files = JsonHelper.Deserialize<string[]>(options[2]);
             var link = options[3];
 
-            if (!"null".Equals(link))
+            if (link != null && !"null".Equals(link))
             {
                 ShareLinkTask shareLinkTask = new ShareLinkTask();
                 shareLinkTask.Title = title;
@@ -100,4 +100,4 @@ public class SMSMessageClass
         public string message { get; set; }
     }
 
-}
\ No newline at end of file
+}