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All of a sudden, a warning started to show on one of the questions which was just answered on my website.

This warning is not showing on any other page on my website but just on one question.

Warning: Invalid argument supplied for foreach() in/home3/name/public_html/directory/qa-include/qa-base.php(591) : eval()'d codeon line77

This same warning is showing 5 times at top of the menu. Can someone please tell me what this is about?

Q2A version: 1.7.1
Remove all plugins, select the Classic theme and try again. Does it still happen?
Hello @pupi1985, I deleted all the plugins one by one and came to know that Q2A Ultimate Seo plugin showing this error. As I deleted that plugin, everything got fixed.

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Try using my fork of the plugin: https://github.com/pupi1985/Q2A-Ultimate-SEO

I think I have already fixed that error and a few others too.
Thanks for your changes @pupi1985, it really fixed the issue... :)
Would you mind making these changes as a pull request for main Q2A-Ultimate-SEO plugin...