Actually that is the smartest thing to do – not use the single quote code character – it is the #1 MOST dangerous coding character when used maliciously by hackers. Probably you saved the custom code to the Root Custom Code Query String Exploits text box instead of the wp-admin Custom Code Query String Exploits text box. In any case, delete the custom code wherever you added it since you are doing the smart thing – not using single quote coding characters in query strings/URL’s.
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