diff --git a/Objective-J/ObjJAcornCompiler.js b/Objective-J/ObjJAcornCompiler.js
index cb7fa83ff..7bc57f61d 100644
--- a/Objective-J/ObjJAcornCompiler.js
+++ b/Objective-J/ObjJAcornCompiler.js
@@ -1106,10 +1106,10 @@ ObjJAcornCompiler.prototype.map = function()
 ObjJAcornCompiler.prototype.prettifyMessage = function(/* Message */ aMessage)
 {
     var line = aMessage.messageForLine,
-        message = "\n" + line;
+        message = "\n" + (line || "");
 
-    message += (new Array(aMessage.messageOnColumn + 1)).join(" ");
-    message += (new Array(Math.min(1, line.length) + 1)).join("^") + "\n";
+    message += (new Array((aMessage.messageOnColumn || 0) + 1)).join(" ");
+    if (line) message += (new Array(Math.min(1, line.length || 1) + 1)).join("^") + "\n";
     message += aMessage.messageType + " line " + aMessage.messageOnLine + " in " + this.URL + ": " + aMessage.message;
 
     return message;