Log errors on filesystem if crash occurs in OTA mode

[Bluesign]

Good morning everybody,
I have a sketch running on an Esp32 devKit where I upload my updates via "elegant OTA". Sometimes my sketch just "freeze" and, without serial monitor, for me it's impossible to understand what is causing the crash.
So I wonder if exist a way to save somewhere on the filesystem of the esp32 what kind of issue it's happening, something like a log error, so that, in a second moment, I could understand how to solve it.
Thanks very much and please excuse me for my bad english
Paolo