Problem with response serialization - text layer

At the endpoint https://lux1.atcomp.pl/minerva/new_api/projects/pdmap_appu_test/maps/52/layers/37/texts/ I encountered a 500 error (Internal Server Error). For some reason, I cannot download the HAR file.

Here is the response I received: { "reason": "Problem with response serialization", "error-id": "84f045e2-9119-472d-b7bc-4f699966f193", "error": "Internal server error." }