fix nil panic #21946

Job	Run time
CHECK PR VALID	3s
Matrixone Standlone CI / Multi-CN e2e BVT Test on Linux/x64(LAUNCH, PROXY)	25m 36s
Matrixone Compose CI / multi cn e2e bvt test docker compose(Optimistic/PUSH)	21m 2s
Matrixone Compose CI / multi cn e2e bvt test docker compose(PESSIMISTIC)	28m 56s
Matrixone CI / SCA Test on Ubuntu/x86	10m 0s
Matrixone CI / UT Test on Ubuntu/x86	39m 23s
Matrixone CI / UT Test on Darwin/x86	0s
Matrixone Standlone CI / e2e BVT Test on Linux/x64(LAUNCH,Optimistic)	31m 20s
Matrixone Standlone CI / e2e BVT Test on Linux/x64(LAUNCH, PESSIMISTIC)	23m 56s
Matrixone Upgrade CI / Compatibility Test With Release on Linux/x64(LAUNCH)	0s
Matrixone Upgrade CI / Compatibility Test With Target on Linux/x64(LAUNCH)	49m 33s
Matrixone Utils CI / check_organization_user	4s
Matrixone Utils CI / pr-size-label	2s
Matrixone Utils CI / PR Unit and BVT Test Coverage	37m 43s
Matrixone Utils CI / docu_issue_check	3s
	4h 27m 41s

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