Comparing 2 x PureBasic source code files. First file is 1,058,924 bytes, second is 1,058,914 bytes. Crash happens every time (fully reproducible).
Using PureBasic 5.71 LTS (Windows - x86) on Windows 10 Pro (64-bit). Doesn't crash with the 64-bit version of PureBasic 5.71 LTS, so it's a bug with the 32-bit release.