diff --git a/mail/base/content/mailCommands.js b/mail/base/content/mailCommands.js
index 3f1c31ec3511..c504adc6a452 100644
--- a/mail/base/content/mailCommands.js
+++ b/mail/base/content/mailCommands.js
@@ -255,8 +255,8 @@ function ComposeMessage(type, format, folder, messageArray)
         identity = getIdentityForServer(server, hintForIdentity);
 
       var messageID = hdr.messageId;
-      var messageIDScheme = messageID.split(":")[0];
-      if ((messageIDScheme == 'http' || messageIDScheme == 'https') &&  "openComposeWindowForRSSArticle" in this) 
+      var messageIDScheme = messageID ? messageID.split(":")[0] : "";
+      if (messageIDScheme && (messageIDScheme == 'http' || messageIDScheme == 'https') &&  "openComposeWindowForRSSArticle" in this) 
         openComposeWindowForRSSArticle(messageID, hdr, type); 
       else if (type == msgComposeType.Reply || type == msgComposeType.ReplyAll || type == msgComposeType.ForwardInline ||
                 type == msgComposeType.ReplyToGroup || type == msgComposeType.ReplyToSender || 
@@ -752,7 +752,7 @@ function JunkSelectedMessages(setAsJunk)
   // Note that this behaviour should match the one in the back end for marking
   // as junk via clicking the 'junk' column.
   
-  if (setAsJunk && pref.getBoolPref("mailnews.ui.junk.manualMarkAsJunkMarksRead"))
+  if (setAsJunk && pref.getBoolPref("mailnews.ui.junk.manualMarkAsJunkMarksRead"))
     MarkSelectedMessagesRead(true);
 
   gDBView.doCommand(setAsJunk ? nsMsgViewCommandType.junk