Hello.

Since the last update to 5.1 I can't insert new pages to the menu.

The error is:

Backtrace

Requesthttp://domain.de/Admin/Menu/Ajax?cmd=insert_after&insert_where=2f&menu=gpmenu&gpreq=json&jsoncallback=jQuery1113007902800364200702_1505204896276&gpx_content=gpabox&_=1505204896277

Details

messageUnexpected token <

stackSyntaxError: Unexpected token < at eval (<anonymous>) at http://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js:2:2622 at Function.globalEval (http://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js:2:2633) at text script (http://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js:5:26520) at Pb (http://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js:5:18379) at x (http://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js:5:21793) at XMLHttpRequest.b (http://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js:5:26030)

responseStatus200

statusTextOK

typeGET

Your Environment

BrowserMozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36

Anyone an idea to resolve this problem?

Rappi

Can it be connected with used theme or plugins?

I work on 5.1 since early beta without any problems on several sites.