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05f239e4a1
I noticed that _SPI_execute_plan initially sets spierrcontext.arg = NULL, and only fills it in some time later. If an error were to happen in between, _SPI_error_callback would try to dereference the null pointer. This is unlikely --- there's not much between those points except push-snapshot calls --- but it's clearly not impossible. Tweak the callback to do nothing if the pointer isn't set yet. It's been like this for awhile, so back-patch to all supported branches.