Added check for MemberExpression

Author: jkimbo

lib/rules/jsx-key.js

@@ -52,6 +52,10 @@ module.exports = function(context) {
 
     // Array.prototype.map
     CallExpression: function (node) {
+      if (node.callee && node.callee.type !== 'MemberExpression') {
+        return;
+      }
+
       if (node.callee && node.callee.property && node.callee.property.name !== 'map') {
         return;
       }