fix: OnAccept panic

[Duslia]

What type of PR is this?

fix

Check the PR title.

• This PR title match the format: <type>(optional scope): <description>
• The description of this PR title is user-oriented and clear enough for others to understand.

(Optional) Translate the PR title into Chinese.

OnAccept 方法在标准库下会 panic

(Optional) More detail description for this PR(en: English/zh: Chinese).

en: OnAccept panic when use standard library
zh(optional): OnAccept 方法在标准库下会 panic

Which issue(s) this PR fixes:

close #507

[Duslia]

#507

[codecov]

Codecov Report

Base: 69.38% // Head: 69.39% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (7288702) compared to base (16de10c).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #514      +/-   ##
===========================================
+ Coverage    69.38%   69.39%   +0.01%     
===========================================
  Files           93       93              
  Lines         8874     8874              
===========================================
+ Hits          6157     6158       +1     
+ Misses        2352     2351       -1     
  Partials       365      365              

Impacted Files	Coverage Δ
pkg/common/config/option.go	100.00% <ø> (ø)
pkg/network/netpoll/transport.go	0.00% <ø> (ø)
pkg/network/standard/transport.go	0.00% <0.00%> (ø)
pkg/app/server/option.go	95.77% <100.00%> (ø)
pkg/common/compress/compress.go	80.95% <0.00%> (-2.86%)	⬇️
pkg/common/timer/timer.go	80.95% <0.00%> (+19.04%)	⬆️

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[li-jin-gou]

LGTM