PHPUnit Segmentation fault on AWS Elastic Beanstalk deployment (exit status 139)

Wondering if anyone has run into this issue or can help shed some light on what it means.

I'm running a Laravel app on Elastic Beanstalk and executing phpunit on deployment. For some reason, and this was working fine before, but I've started getting a segmentation fault during the phpunit run process. I have been Googling on this for days and can't find even a clue as to what I can do about it.

If anyone has any good information on what this is and/or how to address it, please let me know. Thanks!

[Container] 2020/03/09 22:49:01 Running command vendor/bin/phpunit
PHPUnit 8.5.2 by Sebastian Bergmann and contributors.

.........R..............Segmentation fault

[Container] 2020/03/09 22:49:08 Command did not exit successfully vendor/bin/phpunit exit status 139
[Container] 2020/03/09 22:49:08 Phase complete: BUILD State: FAILED
[Container] 2020/03/09 22:49:08 Phase context status code: COMMAND_EXECUTION_ERROR Message: Error while executing command: vendor/bin/phpunit. Reason: exit status 139
[Container] 2020/03/09 22:49:08 Entering phase POST_BUILD