Add missing bounds check

[mrbean-bremen]

• prevents an exception during parsing
• the root cause is a problem with the parser which creates incorrect output, the reason is still unknown
• fixes string index out of range error when using the Windows executable #119

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.99%. Comparing base (e8644e2) to head (a2d9ece).
Report is 36 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   89.82%   89.99%   +0.16%     
==========================================
  Files          15       15              
  Lines        1632     1699      +67     
==========================================
+ Hits         1466     1529      +63     
- Misses        166      170       +4     

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