When using git, press ctrl+z in vim editing interface to exit. How can I return to editing interface?

  git, question

Using git on windows, rungit commit -aAt the time of command, I entered the vim editing interface. At this time, I accidentally pressed ctrl+z to exit the vim editing interface, returned to the command line, and displayed this message:

$ git commit -a
 Vim: Read Error, Exiting  ...
 Vim: Finished.

At this time, it will run again.git commit -aThe following message will appear:

$ git commit -a //ctrl+z exit and run git commit -a again
 fatal: Unable to create 'C:/Users/dell/gittest/.git/index.lock': File exists.
 Another git process seems to be running in this repository, e.g.
 an editor opened by 'git commit'. Please make sure all processes
 are terminated then try again. If it still fails, a git process
 may have crashed in this repository earlier:
 remove the file manually to continue.

TryfgGo back, but no, display the following information:

$ fg
 bash: fg: current: no such job

What should I do?

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