This could be a pure & simple error in your code, or it could be that you have not fully handled all possible scenarios; eg, a glitch might cause a value to be read from a port that is (way) outside the normal range - if your software doesn't properly handle this, it could well crash.
There are obviously two issues in this example:

The hardware issue that your circuit is susceptible to glitches;

The software issue that a glitch can crash it!

It's that 90:10 Rule again!