good first issuehelp wanted
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描述
Describe the bug The property 'editor' can be undefined (see Screenshots section).
To Reproduce Steps to reproduce the behavior:
- Start VSCode
- Check Breakpoints > Promise Rejects and Breakpoints > Uncaught Exceptions
- Start my extension in debug mode (Debugger > Launch client). I believe, that can be reproduced with any extension, though it happened to me during development of mine plugin.
- If any file is opened after start, close all of them and start again.
Expected behavior The absence of the error.
Screenshots

Environment (please complete the following information):
- Extension (VsCodeVim) version: 0.16.3
- VSCode version: 1.27.1
- OS: Ubuntu 16.04
Additional context
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Probably, that is same as #3030.
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Code line I am talking about is src/mode/modeHandler.ts#1324