Fix Uninitialized string offset -1 warning

[staabm]

closes #118

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.00%. Comparing base (df95a6e) to head (2c3940e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #119   +/-   ##
=========================================
  Coverage     99.00%   99.00%           
- Complexity      140      142    +2     
=========================================
  Files            15       15           
  Lines           400      402    +2     
=========================================
+ Hits            396      398    +2     
  Misses            4        4           

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[nuernbergerA]

can confirm that this fixes it

[bastienho]

The patch works for me.

Thank you for the alacrity

[xabbuh]

I can confirm that the patch fixes failures that were caused by 6.2.0 on the Symfony test suite. 👍

[staabm]

In phpstan/phpstan-src#3594 I am working on a PHPStan fix, so such errors will be reported by static analysis the next time before we release