Fix IndexError when resuming after some workers are done

[philgzl]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #563.

PR review

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 79%. Comparing base (779eca4) to head (5266bd4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #567   +/-   ##
===================================
- Coverage    79%    79%   -0%     
===================================
  Files        40     40           
  Lines      6099   6101    +2     
===================================
+ Hits       4820   4821    +1     
- Misses     1279   1280    +1     

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