Bug 920532 - Lots of "System JS : ERROR file:///builds/slave/test/build/b2g/components/MozKeyboard.js:380 TypeError: this._inputcontext is null" r=me

b2g/components/MozKeyboard.js

@@ -377,7 +377,9 @@ MozInputMethod.prototype = {
         }
         break;
       case 'Keyboard:SelectionChange':
+        if (this.inputcontext) {
           this._inputcontext.updateSelectionContext(json);
+        }
         break;
       case 'Keyboard:GetContext:Result:OK':
         this.setInputContext(json);