API endpoint has ERR_EMPTY_RESPONSE in Chrome, but works in Firefox

Question

I have a dev environment running locally:

• Apache
• PHP
• Self-signed wildcard SSL certificate

When I go directly to one of my API endpoints in Chrome, I see the "ERR_EMPTY_RESPONSE" error. This also adds this error to the apache log (/usr/local/var/log/httpd/error_log):

[Sun Feb 09 20:32:36.097439 2020] [core:notice] [pid 4448] AH00052: child pid 19259 exit signal Segmentation fault (11)

Some API endpoints never work. Some API endpoints will get the response after a hard refresh.

When I go to the exact same API endpoints in Firefox or Safari, it succeeds every time and there is nothing added to the apache log.

Why is this happening? Or how can I get more information about that seg fault? Any help is appreciated.