My wordpress website does not show 404 page and results in http 500 error

Since changing your theme makes everything come back to normal, then, basically, it means the problem is from the theme you wish to use.

It looks like the theme is missing templates that should show up upon returning ‘no results’ for your query, or, there are errors in the template(s) supposed to display.

This scenario should show a ‘no results’ template and not really a 404 page.

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