diff --git a/lib/ios.js b/lib/ios.js
index 85c7ba7..18448b0 100644
--- a/lib/ios.js
+++ b/lib/ios.js
@@ -5,9 +5,21 @@ const path = require('path');
 const logger = require('./common/logger');
 const XCTest = require('xctest-client');
 const Simulator = require('ios-simulator');
+const pkg = require('../package.json');
+const chalk = require('chalk');
 
 const _ = require('./common/helper');
 
+function reportNodesError(source) {
+  return chalk.red(
+    `The source may be wrong, please report with below message at:
+    ${chalk.blue(pkg.bugs)}
+    ****** xctest source start *******
+    ${JSON.stringify(JSON.parse(source))}
+    '****** xctest source end *******`
+  );
+}
+
 const adaptor = function(node) {
   node.class = node.type;
 
@@ -44,8 +56,16 @@ exports.dumpXMLAndScreenShot = function *() {
   _.mkdir(tempDir);
   const xmlFilePath = path.join(tempDir, 'ios.json');
 
+  let compatibleTree;
+  try {
+    compatibleTree = adaptor(tree);
+  } catch(e) {
+    console.error(reportNodesError(source));
+    throw e;
+  }
+
+  fs.writeFileSync(xmlFilePath, JSON.stringify(compatibleTree), 'utf8');
   logger.debug(`Dump iOS XML success, save to ${xmlFilePath}`);
-  fs.writeFileSync(xmlFilePath, JSON.stringify(adaptor(tree)), 'utf8');
 
   const screenshot = yield _.request(`http://${xctest.proxyHost}:${xctest.proxyPort}/screenshot`, 'get', {});
   const base64Data = JSON.parse(screenshot).value;
diff --git a/package.json b/package.json
index 4da4769..8f2018d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "app-inspector",
-  "version": "1.2.8",
+  "version": "1.2.9",
   "description": "app inspector",
   "keywords": [
     "inspector",
@@ -64,6 +64,7 @@
     "jshint"
   ],
   "homepage": "https://github.com/macacajs/app-inspector",
+  "bugs": "https://github.com/macacajs/app-inspector/issues/new",
   "license": "MIT",
   "optionalDependencies": {
     "ios-simulator": "^1.0.7",