Fix to fail to save the data to cache

[SimFG]

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[codecov]

Codecov Report

Merging #224 (64759f3) into dev (4dddcf0) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

❗ Current head 64759f3 differs from pull request most recent head 33012ce. Consider uploading reports for the commit 33012ce to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #224      +/-   ##
==========================================
- Coverage   92.73%   92.67%   -0.07%     
==========================================
  Files          52       52              
  Lines        1584     1584              
==========================================
- Hits         1469     1468       -1     
- Misses        115      116       +1     

Impacted Files	Coverage Δ
gptcache/adapter/openai.py	92.06% <100.00%> (+0.79%)	⬆️

... and 1 file with indirect coverage changes