Error message from git update is not helpful.

[ma2ciek]

I've got following error after git update:

(node:11920) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): TypeError: msg.trim is not a function

I checked packages and one of them was on the other branch that needs to merge after git pull

 #  @ckeditor/ckeditor5-utils                                            16/18 (89%) 
Your configuration specifies to merge with the ref 'refs/heads/t/116'
from the remote, but no such ref was fetched.

So the error from git update could be similar to provide a useful insight into the problem.

[pomek]

Would be nice to have some steps to reproduce. It speeds up the fix.

[ma2ciek]

Aw, I read the message once again and it was particularly my fault to pull already not-existing branch.

mgit.json:

{
  "packages": "packages/",
  "dependencies": {
    "@ckeditor/ckeditor5-autoformat": "ckeditor/ckeditor5-autoformat",
    "@ckeditor/ckeditor5-basic-styles": "ckeditor/ckeditor5-basic-styles",
    "@ckeditor/ckeditor5-clipboard": "ckeditor/ckeditor5-clipboard",
    "@ckeditor/ckeditor5-core": "ckeditor/ckeditor5-core",
    "@ckeditor/ckeditor5-editor-classic": "ckeditor/ckeditor5-editor-classic",
    "@ckeditor/ckeditor5-engine": "ckeditor/ckeditor5-engine",
    "@ckeditor/ckeditor5-enter": "ckeditor/ckeditor5-enter",
    "@ckeditor/ckeditor5-heading": "ckeditor/ckeditor5-heading",
    "@ckeditor/ckeditor5-image": "ckeditor/ckeditor5-image",
    "@ckeditor/ckeditor5-link": "ckeditor/ckeditor5-link",
    "@ckeditor/ckeditor5-list": "ckeditor/ckeditor5-list",
    "@ckeditor/ckeditor5-markdown-gfm": "ckeditor/ckeditor5-markdown-gfm",
    "@ckeditor/ckeditor5-paragraph": "ckeditor/ckeditor5-paragraph",
    "@ckeditor/ckeditor5-theme-lark": "ckeditor/ckeditor5-theme-lark",
    "@ckeditor/ckeditor5-typing": "ckeditor/ckeditor5-typing",
    "@ckeditor/ckeditor5-ui": "ckeditor/ckeditor5-ui",
    "@ckeditor/ckeditor5-undo": "ckeditor/ckeditor5-undo",
    "@ckeditor/ckeditor5-utils": "ckeditor/ckeditor5-utils#t/116"
  }
}

And then run mgit update