fix: peer id is nil

[simlecode]

关联的Issues (Related Issues)

close #475

改动 (Proposed Changes)

附注 (Additional Info)

自查清单 (Checklist)

在你认为本 PR 满足被审阅的标准之前，需要确保 / Before you mark the PR ready for review, please make sure that:

• 符合Venus项目管理规范中关于PR的相关标准 / The PR follows the PR standards set out in the Venus project management guidelines
• 具有清晰明确的commit message / All commits have a clear commit message.
• 包含相关的的测试用例或者不需要新增测试用例 / This PR has tests for new functionality or change in behaviour or not need to add new tests.
• 包含相关的的指南以及文档或者不需要新增文档 / This PR has updated usage guidelines and documentation or not need
• 通过必要的检查项 / All checks are green

[codecov-commenter]

Codecov Report

Merging #474 (148bed9) into master (9a8cf5d) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

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

@@            Coverage Diff             @@
##           master     #474      +/-   ##
==========================================
- Coverage   19.72%   19.69%   -0.03%     
==========================================
  Files         200      200              
  Lines       25880    25889       +9     
==========================================
- Hits         5105     5100       -5     
- Misses      19894    19907      +13     
- Partials      881      882       +1     

Flag	Coverage Δ
unittests	19.69% <0.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
client/client.go	8.69% <0.00%> (-0.07%)	⬇️

... and 1 file with indirect coverage changes

[LinZexiao]

LGTM