Links not working anymore in iOS with onclick method


I recently upgrade my system, which now looks the following:

Cordova CLI: 6.0.0
Ionic CLI Version: 1.7.14
Ionic App Lib Version: 0.7.0
ios-deploy version: 1.8.5 
ios-sim version: 5.0.6 
OS: Mac OS X El Capitan
Node Version: v5.6.0
Xcode version: Xcode 7.2.1 Build version 7C1002 

Zyklotrop:platforms michael$ cordova plugin list
cc.fovea.cordova.purchase 4.0.0 "Purchase"
cordova-plugin-console 1.0.2 "Console"
cordova-plugin-crosswalk-webview 1.5.0 "Crosswalk WebView Engine"
cordova-plugin-inappbrowser 1.3.1-dev "InAppBrowser"
cordova-plugin-splashscreen 3.1.0 "Splashscreen"
ionic-plugin-keyboard 1.0.8 “Keyboard”

├── bower@1.7.7
├── cordova@6.0.0
├── grunt-cli@0.1.13
├── ionic@1.7.14
├── ios-deploy@1.8.5
├── ios-sim@5.0.6
├── node-gyp@3.3.0
└── npm@3.6.0

I am using node.js version 5.6.0

Before upgrading my hyperlinks worked. But now not anymore!

<p>More Information here <a href="#" onclick="'', '_system', 'location=yes'); return false;">hier</a>.</p>
is not popping up.

It is working on Android devices and in browser, but not in Xcode Simulator and on iOS devices.

Here is the log from the Xcode simulator:
Feb 21 17:26:07 Zyklotrop Schafkopf-Liste[88467]: ERROR Internal navigation rejected - not set for url='
Feb 21 17:29:16 Zyklotrop routined[88358]: CoreLocation: Error occurred while trying to retrieve motion state update: CMErrorDomain Code:104
Feb 21 17:30:03 Zyklotrop suggestd[88395]: Connection interrupted!

How to fix this?