and found the same issue.
With this nasty as a search term,
LP0060BK'nvOpzp; AND 1=1 OR ('"iKO)),&
the opening bracket was in the IF clause (the double quotes and the rest get thrown away) and unbalanced the Select section in addition to the unbalanced query in POSM!
I eventually figured out this was also installed in combination with POSM https://github.com/lat9/products_options_stock/issues/229
and found the same issue. With this nasty as a search term,
LP0060BK'nvOpzp; AND 1=1 OR ('"iKO)),&
the opening bracket was in the IF clause (the double quotes and the rest get thrown away) and unbalanced the Select section in addition to the unbalanced query in POSM!
So here also:
to
cures it.