Wordpress Cache-Enabler Plugin CSSrules issue?

Hi
I found this css error below, would like to know where to dig if you please

I suspect this is related to Cache enabler settings

Code (Text):

Uncaught DOMException: Failed to read the 'cssRules' property from 'CSSStyleSheet': Cannot access rules
    at et_core_page_resource_fallback (https://domain.com/:1:430)
    at HTMLLinkElement.onload (https://domain.com/:1:50736)
et_core_page_resource_fallback @ (index):1
onload @ (index):1
2(index):1 

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fixed,... it was due to the theme itself due js and css modifications and join

 

more update. it was due to CDN enabler plugin, any tips?

 

I use it and sent to support to debug that issue

 

update for reference,

I use gumlet for image CDN
when using another cdn URL in cdn enabler other than gumlet this error happens