Unexpected end of JSON input at loading register.ts

Describe the bug
vscode keeps rendering the following error in debug console:

console.ts:137 [Extension Host] stack trace: SyntaxError: Unexpected end of JSON input    at JSON.parse (<anonymous>)    at /Users/<user>/.vscode/extensions/vscodevim.vim-1.22.2/src/register/register.ts:373:33
E @ console.ts:137

 ERR Unexpected end of JSON input: SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at /Users/<user>/.vscode/extensions/vscodevim.vim-1.22.2/src/register/register.ts:373:33 

To Reproduce
Steps to reproduce the behavior:

1. Install vscodevim
2. Toggle Developer Tools
3. Reload the Window
4. Observe the above error message

Expected behavior
There should be no error.
I've checked register.ts and there is clearly no L373 so I am not sure what happens here.

Screenshots
N/A

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.22.2
• VSCode version: 1.67.2 (Universal)
• OS: Darwin arm64 21.5.0

Additional context
N/A

The report points to src/register/register.ts and a JSON.parse failure at the reported line 373. Reproduce the error with the listed VSCodeVim and VSCode versions, then inspect the JSON input used there. Done means reloading the extension no longer produces the Unexpected end of JSON input error.