Symfony 2.8 debug toolbar renders empty -


i found debug toolbar has empty content:

<div id="sftoolbarmaincontent-c7947c" class="sf-toolbarreset clear-fix" data-no-turbolink>  <a class="hide-button" title="close toolbar" tabindex="-1" accesskey="d" onclick="     var p = this.parentnode;     p.style.display = 'none';     (p.previouselementsibling || p.previoussibling).style.display = 'none';     document.getelementbyid('sfminitoolbar-c7947c').style.display = 'block';     sfjs.setpreference('toolbar/displaystate', 'none'); ">     <svg version="1.1" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" width="24" height="24" viewbox="0 0 24 24" enable-background="new 0 0 24 24" xml:space="preserve"> <path fill="#aaaaaa" d="m21.1,18.3c0.8,0.8,0.8,2,0,2.8c-0.4,0.4-0.9,0.6-1.4,0.6s-1-0.2-1.4-0.6l12,14.8l-6.3,6.3 c-0.4,0.4-0.9,0.6-1.4,0.6s-1-0.2-1.4-0.6c-0.8-0.8-0.8-2,0-2.8l9.2,12l2.9,5.7c-0.8-0.8-0.8-2,0-2.8c0.8-0.8,2-0.8,2.8,0l12,9.2 l6.3-6.3c0.8-0.8,2-0.8,2.8,0c0.8,0.8,0.8,2,0,2.8l14.8,12l21.1,18.3z"/> </svg> </a> </div>

enter image description here

instead of correct 1 (you may see accessing route /app_dev.php/_wdt/78273e, 78273e - example hash):

enter image description here

no js , page errors, tags body ok. have no idea when did become broken. did face such case?


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