"Unexpected Token" in Backend Application

Die debug-all-ext.js ist aktiv … aus dem Trace werde ich leider überhaupt nicht schlau:

 

SyntaxError: Unexpected token <
    at http://shopware.local/engine/Library/ExtJs/ext-all-debug.js?201806131541:528:18
    at Object.Ext.globalEval (http://shopware.local/engine/Library/ExtJs/ext-all-debug.js?201806131541:529:10)
    at Object.success (http://shopware.local/backend/base?file=bootstrap&loggedIn=1531943924:530:5)
    at Object.callback (http://shopware.local/engine/Library/ExtJs/ext-all-debug.js?201806131541:6455:26)
    at constructor.onComplete (http://shopware.local/engine/Library/ExtJs/ext-all-debug.js?201806131541:38086:17)
    at constructor.onStateChange (http://shopware.local/engine/Library/ExtJs/ext-all-debug.js?201806131541:38047:18)
    at XMLHttpRequest. (http://shopware.local/engine/Library/ExtJs/ext-all-debug.js?201806131541:1816:27)

Die Developerconsole schweigt sich beharrlich aus :frowning: