fix: uninitiated mutex

[MeteorsLiu]

Resolve #1133

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.64%. Comparing base (450a363) to head (69b2bfd).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1134   +/-   ##
=======================================
  Coverage   86.64%   86.64%           
=======================================
  Files          29       29           
  Lines        7343     7343           
=======================================
  Hits         6362     6362           
  Misses        914      914           
  Partials       67       67           

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