Good catch! For example this query from WP core is also affected.

Originally I thought that this is handled by WordPress by default, but it is done later :-( VersionPress is using custom method query() before using __wp_query() based on original function which handles queries with strip_invalid_text_from_query() method. Maybe we could take some more inspiration from it, they are using ltrim() and also DESCRIBE, DESC and EXPLAIN queries could be ignored (not very frequent).

PR works for me, thank you @mkreckovic!

@borekb can you please take a look and perhaps merge this one?

It looks good to me, sorry for not getting to this earlier. Just to confirm, @candrews, you find the code correct, right?

you find the code correct, right?

Yes - it looks good to me as well.

Thanks for confirming. I'm going to merge the PR then – props to @mkreckovic!