diff --git a/lib/ace/commands/multi_select_commands.js b/lib/ace/commands/multi_select_commands.js
index ed396fb3..ebac5cc7 100644
--- a/lib/ace/commands/multi_select_commands.js
+++ b/lib/ace/commands/multi_select_commands.js
@@ -92,7 +92,7 @@ exports.multiSelectCommands = [{
     bindKey: "esc",
     exec: function(editor) { editor.exitMultiSelectMode(); },
     readonly: true,
-    isAvailable: function(editor) {return editor.inMultiSelectMode}
+    isAvailable: function(editor) {return editor && editor.inMultiSelectMode}
 }];
 
 var HashHandler = require("../keyboard/hash_handler").HashHandler;