Exclude a certain source from cache

Dear Emre

we have a issue with our live-chat function (an iframe overlay) and wpfc (we use premium). as long wpfc is active we receive a few thousand messages within the developer console like that:

TypeError: p.getBoundingClientRect is not a function
at Object.c ((index):751)
at Object.r ((index):751)
at (index):751
at Array.forEach (<anonymous>)
at Object.ls ((index):751)
at (index):751
at Function.fa (fn3qb.js:1)
at Function.a.find (fn3qb.js:6)
at a.fn.init.find (fn3qb.js:1)
at a.fn.init.a.fn.find (fn3qb.js:6)
==> <iframe id=​”lz_chat_overlay_file_upload_frame”>​…​</iframe>​

How could we exclude this from cache? This line causes the problem:

script data-wpfc-render="false">var Wpfcll={s:[],i:function(){Wpfcll.ss();window.addEventListener('load',function(){window.addEventListener("DOMSubtreeModified",function(e){Wpfcll.ss();Wpfcll.ls(false);},false);Wpfcll.ls(true);});window.addEventListener('scroll',function(){Wpfcll.ls(false);});window.addEventListener('resize',function(){Wpfcll.ls(false);});window.addEventListener('click',function(){Wpfcll.ls(false);});},c:function(e,pageload){var w=document.documentElement.clientHeight || body.clientHeight;var n=pageload ? 0:800;var er=e.getBoundingClientRect();var t=0;var p=e.parentNode;var pr=p.getBoundingClientRect();if(er.x==0 && er.y==0){for(var i=0;i < 10;i++){if(p){if(pr.x==0 && pr.y==0){p=p.parentNode;pr=p.getBoundingClientRect();}else{t=pr.top;break;}}};}else{t=er.top;}if(w - t+n > 0){return true;}return false;},r:function(e,pageload){var s=this;var oc,ot;try{if(s.c(e,pageload)){oc=e.getAttribute("data-wpfc-original-src");ot=e.getAttribute("data-wpfc-original-srcset");if(oc || ot){if(oc){e.setAttribute('src',oc);}if(ot){e.setAttribute('srcset',ot);}e.removeAttribute("data-wpfc-original-src");e.removeAttribute("onload");if(e.tagName=="IFRAME"){e.onload=function(){var s=e.getAttribute("src").match(/templates\/youtube\.html\#(.+)/);var y="https://www.youtube.com/embed/";if(s){try{var i=e.contentDocument || e.contentWindow;if(i.location.href=="about:blank"){e.setAttribute('src',y+s[1]);}}catch(err){e.setAttribute('src',y+s[1]);}}}}}}}catch(error){console.log(error);console.log("==>",e);}},ss:function(){var i=Array.prototype.slice.call(document.getElementsByTagName("img"));var f=Array.prototype.slice.call(document.getElementsByTagName("iframe"));this.s=i.concat(f);},ls:function(pageload){var s=this;[].forEach.call(s.s,function(e,index){s.r(e,pageload);});}};document.addEventListener('DOMContentLoaded',function(){wpfci();});function wpfci(){Wpfcll.i();}</script>

Thank you in advance Marc

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