fix runtime issue of IOBuffer backend

[JonasIsensee]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.38%. Comparing base (f8fefb6) to head (993b532).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #704      +/-   ##
==========================================
- Coverage   87.40%   87.38%   -0.03%     
==========================================
  Files          37       37              
  Lines        4588     4588              
==========================================
- Hits         4010     4009       -1     
- Misses        578      579       +1     

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