Describe the bug
When migrated to a newer version of the generator, we started to get the same message as corrected in #273.

It seems like the newly added support for parsing FNDA section experiences a similar overflow, as it uses:
int.Parse(...)
rather than
line.Substring(...).ParseLargeInteger();

To Reproduce
It heavily depends on the contents of the LCOV output file, so it cannot be reproduced without sharing the entire source.