Fix the potential fetch error

[LinuxSuRen]

No description provided.

[codecov]

Codecov Report

Merging #199 (9626d3a) into master (6d93d84) will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #199      +/-   ##
==========================================
- Coverage   14.59%   14.50%   -0.10%     
==========================================
  Files          30       30              
  Lines        1720     1731      +11     
==========================================
  Hits          251      251              
- Misses       1450     1461      +11     
  Partials       19       19              

Flag	Coverage Δ
unittests	14.50% <0.00%> (-0.10%)	⬇️

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Impacted Files	Coverage Δ
cmd/install.go	0.00% <0.00%> (ø)
pkg/installer/fetch.go	0.00% <0.00%> (ø)

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