crash after set registry mirrors and restart

[xujihui1985]

Expected behavior

apply and restart successfully

Actual behavior

crash

Information

mac: 10.13.3
dockerformac: 17.12.0-ce-mac49

the daemon could be restart successfully if registry mirror leave blank. the registry mirror should be fine because it has been working fine for couple of months with pervious version of dockerformac
I also check the syslog

allow_other,max_read=1048576,subtype=osxfs /Volumes Jan 27 09:24:07 seandeMacBook-Pro Docker[3287]: transfused: mount /bin/fusermount -o allow_other,max_read=1048576,subtype=osxfs /Users Jan 27 09:24:07 seandeMacBook-Pro Docker[3287]: Negotiated transfuse notification channel for /tmp Jan 27 09:24:07 seandeMacBook-Pro Docker[3287]: Negotiated transfuse notification channel for /private Jan 27 09:24:07 seandeMacBook-Pro Docker[3287]: Negotiated transfuse notification channel for /Volumes Jan 27 09:24:07 seandeMacBook-Pro Docker[3287]: Negotiated transfuse notification channel for /Users Jan 27 09:24:07 seandeMacBook-Pro Docker[3287]: sending continue to client Jan 27 09:24:07 seandeMacBook-Pro Docker[3287]: Fatal unexpected exception: Socket.Closed Jan 27 09:24:14 seandeMacBook-Pro Docker[3312]: Logging to Apple System Log Jan 27 09:26:24 seandeMacBook-Pro com.apple.xpc.launchd[1] (com.docker.vmnetd): Unknown key for string: Version
the cause should be Fatal unexpected exception: Socket.Closed

[genert]

Same behaviour here.

Mac: 10.12.6
Dockerformac: 17.12.0-ce-mac49

[pgayvallet]

Duplicate of #2537

[guillaumerose]

#2537 is now fixed

[docker-robott]

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