Add nil guard

[goccy]

SSIA

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 77.33%. Comparing base (1375813) to head (06ac707).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #600      +/-   ##
==========================================
- Coverage   77.35%   77.33%   -0.03%     
==========================================
  Files          21       21              
  Lines        7829     7835       +6     
==========================================
+ Hits         6056     6059       +3     
- Misses       1354     1356       +2     
- Partials      419      420       +1