Same error.
Using autoptimize plugin for minification, but inline js minification is turned off. Somehow the part of code that outputs adsTringId never makes it into html.
Current workaround is to use older version, 2.6.3.1
I would recommend reworking that inline js with a standard js file and sending variables with wp_localize_script.
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This reply was modified 5 years, 2 months ago by MSTannu.
I have the same error. This might be related to King Composer content builder plugin.
