fix triple npe

[icodening]

What is the purpose of the change

fix triple npe
#12862

Brief changelog

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

40.0% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #12918 (d741e8c) into 3.2 (972a081) will increase coverage by 2.43%.
Report is 5 commits behind head on 3.2.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.2   #12918      +/-   ##
============================================
+ Coverage     67.00%   69.43%   +2.43%     
  Complexity        2        2              
============================================
  Files          1782     1648     -134     
  Lines         71829    68380    -3449     
  Branches      10260     9992     -268     
============================================
- Hits          48127    47479     -648     
+ Misses        19072    16318    -2754     
+ Partials       4630     4583      -47     

see 169 files with indirect coverage changes

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[EarthChen]

Can this part be precomputed

[EarthChen]

.

[EarthChen]

LGTM