Check reader if it's nil before reading

[noahyao1024]

• With pull requests:
  • Open your pull request against master
  • Your pull request should have no more than two commits, if not you should squash them.
  • It should pass all tests in the available continuous integration systems such as GitHub Actions.
  • You should add/modify tests to cover your proposed code changes.
  • If your pull request contains a new feature, please document it on the README.

[appleboy]

@noahyao1024 Please add some testing flow.

[codecov[bot]]

Codecov Report

Merging #3419 (a0ea288) into master (80cd679) will decrease coverage by 0.09%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3419      +/-   ##
==========================================
- Coverage   98.27%   98.18%   -0.10%     
==========================================
  Files          42       42              
  Lines        3137     3140       +3     
==========================================
  Hits         3083     3083              
- Misses         40       42       +2     
- Partials       14       15       +1     

Flag	Coverage Δ
	98.18% <0.00%> (-0.10%)	:arrow_down:
go-1.16	?
go-1.17	98.08% <0.00%> (-0.10%)	:arrow_down:
go-1.18	98.08% <0.00%> (-0.10%)	:arrow_down:
go-1.19	98.18% <0.00%> (-0.10%)	:arrow_down:
macos-latest	98.08% <0.00%> (-0.19%)	:arrow_down:
ubuntu-latest	98.18% <0.00%> (-0.10%)	:arrow_down:

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

Impacted Files	Coverage Δ
context.go	97.47% <0.00%> (-0.50%)	:arrow_down:

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