Ever happened,.. ? the whole Application crash due to a bug in one of the libraries used and you skim through the code a million times, make a billion changes but the app still crashes.

Yes, me too.
And even worse, I encountered the infamous compiler bug, I think two times in my dev career. Those were two of the rare cases where I had to dive deep down to assembler code to find the source of the problem and a workaround.
That really sucks, because we all usually trust modern compilers and you already lost days, maybe weeks checking everything else several times before checking the unthinkable.

Yes one time this node program kept crashing and I check the source of one of the libraries and see process.exit() when some strange condition is met