Fix race condition

[k1LoW]

SSIA.

[github-actions]

Code Metrics Report

	main (535246b)	#74 (3b43278)	+/-
Coverage	81.7%	82.0%	+0.3%
Code to Test Ratio	1:0.4	1:0.4	-0.0
Test Execution Time	17s	18s	+1s

Details

  |                     | main (535246b) | #74 (3b43278) |  +/-  |
  |---------------------|----------------|---------------|-------|
+ | Coverage            |          81.7% |         82.0% | +0.3% |
  |   Files             |              3 |             3 |     0 |
  |   Lines             |            639 |           650 |   +11 |
+ |   Covered           |            522 |           533 |   +11 |
- | Code to Test Ratio  |          1:0.4 |         1:0.4 |  -0.0 |
  |   Code              |           2152 |          2163 |   +11 |
  |   Test              |            883 |           883 |     0 |
- | Test Execution Time |            17s |           18s |   +1s |

Code coverage of files in pull request scope (82.7% → 83.1%)

Files	Coverage	+/-
grpcstub.go	83.1%	+0.4%

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Reported by octocov