diff --git a/lib/ace/keyboard/hash_handler.js b/lib/ace/keyboard/hash_handler.js
index 9f0d7128..e56b0b13 100644
--- a/lib/ace/keyboard/hash_handler.js
+++ b/lib/ace/keyboard/hash_handler.js
@@ -121,10 +121,14 @@ function HashHandler(config, platform) {
         var key = typeof binding == "string" ? binding: binding[this.platform];
         this.bindKey(key, command);
     };
-	
-	// accepts keys in the form ctrl+Enter or ctrl-Enter
-	// keys without modifiers or shift only 
+
+    // accepts keys in the form ctrl+Enter or ctrl-Enter
+    // keys without modifiers or shift only 
     this.parseKeys = function(keys) {
+        // todo support keychains 
+        if (keys.indexOf(" ") != -1)
+            keys = keys.split(/\s+/).pop();
+
         var parts = keys.toLowerCase().split(/[\-\+]([\-\+])?/).filter(function(x){return x});
         var key = parts.pop();
 
@@ -139,8 +143,11 @@ function HashHandler(config, platform) {
         var hashId = 0;
         for (var i = parts.length; i--;) {
             var modifier = keyUtil.KEY_MODS[parts[i]];
-            if (modifier == null)
-                throw "invalid modifier " + parts[i] + " in " + keys;
+            if (modifier == null) {
+                if (typeof console != "undefined")
+                console.error("invalid modifier " + parts[i] + " in " + keys);
+                return false;
+            }
             hashId |= modifier;
         }
         return {key: key, hashId: hashId};