Numeric tag cannot be deleted on UI

Summary

Bitbucket cannot delete tag consisting of numeric digits.

Environment

• Bitbucket Server v5.0.x

Steps to Reproduce

1. Create a tag named "100200300" (from browser or CUI)
2. Delete the tag
   • 
3. Reload the page
4. Confirm the tag remains

Expected Results

User can delete numeric tags on web UI.

Actual Results

The below error is thrown in the browser console from commit-tags.js:

Uncaught TypeError: x.split is not a function

Note

• It's able to delete numeric tag which starts with "0"

Workaround

• Delete the tag via git or mercurial command