When you try to execute arcanist's patch command without authentication token (even if nobody would normally do that) you got the exception above :
[2023-08-10 16:14:06] EXCEPTION: (RuntimeException) strlen(): Passing null to parameter #1 ($string) of type string is deprecated at [<arcanist>/src/error/PhutilErrorHandler.php:261] arcanist(head=master, ref.master=788098096e11), phorge(head=master, ref.master=eb2be08f9f0e) #0 PhutilErrorHandler::handleError(integer, string, string, integer) called at [<arcanist>/src/workflow/ArcanistWorkflow.php:483] #1 ArcanistWorkflow::authenticateConduit() called at [<arcanist>/src/workflow/ArcanistPatchWorkflow.php:398] #2 ArcanistPatchWorkflow::run() called at [<arcanist>/scripts/arcanist.php:427] <<< [1] (+607) <exec> 607,238 us