Often you get a fatal error to deal with but where the problem code is not always very clear where the problem is.
This is especially difficult for fatal errors like "NOTICE: PHP message: PHP Fatal error: Allowed memory size of 134217728 bytes exhausted
.
When memory errors any debugging can easily influence the location the fatal is triggered.
Everything on the Internet states that you cant get a stack trace for a fatal. The most common suggested solution is to use a custom shutdown function to at least handle the fatal in some way maybe log it.