Allowed memory size of 134217728 bytes exhausted into Bugsnag library

I see a few errors like this (different parts of Bugsnap):

production.ERROR: Allowed memory size of 134217728 bytes exhausted (tried to allocate 20480 bytes) {"exception":"[object] (Symfony\Component\ErrorHandler\Error\FatalError(code: 0): Allowed memory size of 134217728 bytes exhausted (tried to allocate 20480 bytes) at /var/www/html/vendor/bugsnag/bugsnag/src/Report.php:683)

But I have memory_limit=3G for PHP CLI and FPM, and I don’t have ‘ini_set’ for memory_limit into PHP code.

So my question is: how I can find and fix the source of these errors?