fix: potential nil pointer dereference in log

[reugn]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 89.67%. Comparing base (ce9418d) to head (6d1fa0b).

Files	Patch %	Lines
quartz/scheduler.go	0.00%	4 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
+ Coverage   89.65%   89.67%   +0.02%     
==========================================
  Files          19       19              
  Lines         918      920       +2     
==========================================
+ Hits          823      825       +2     
- Misses         66       67       +1     
+ Partials       29       28       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.