Fix the problem thrown by error

[WeiLoy]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1859 (aed6b88) into feature/compatible-with-evm (e36fd4b) will increase coverage by 0.77%.
The diff coverage is 58.13%.

@@                       Coverage Diff                       @@
##           feature/compatible-with-evm    #1859      +/-   ##
===============================================================
+ Coverage                        50.42%   51.19%   +0.77%     
===============================================================
  Files                              514      523       +9     
  Lines                            60757    64340    +3583     
===============================================================
+ Hits                             30636    32941    +2305     
- Misses                           26546    27684    +1138     
- Partials                          3575     3715     +140     

Flag	Coverage Δ
unittests	51.19% <58.13%> (+0.77%)	⬆️

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

Impacted Files	Coverage Δ
accounts/abi/bind/auth.go	0.00% <0.00%> (ø)
accounts/abi/bind/backends/simulated.go	0.00% <0.00%> (ø)
accounts/keystore/file_cache.go	100.00% <ø> (ø)
accounts/keystore/wallet.go	8.33% <0.00%> (+2.08%)	⬆️
accounts/manager.go	0.00% <0.00%> (ø)
cmd/platon/chaincmd.go	0.00% <0.00%> (ø)
cmd/platon/config.go	0.00% <0.00%> (ø)
cmd/platon/misccmd.go	0.00% <0.00%> (ø)
cmd/platon/usage.go	11.62% <ø> (ø)
cmd/utils/cmd.go	0.00% <0.00%> (ø)
... and 253 more

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[benbaley]

fix #1819