Search stopped working

Ajax search used to work perfectly. Not sure when the issue started, but it does not return any results. I’ve flushed cache/minify etc. and also tried turning each plugin on and off again… no luck. Any idea what this could be? Here’s a link to the Debug Data:
https://paste.ee/p/ylzIc#vhR4XrcGXLHSq5xy9udZb7dNU7dDcoHu

Any help would be greatly appreciated. Thank you.
Deb

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