Split functionality shows error when editing the Remaining estimate of the parent issue

Issue Summary

• Split functionality shows error when editing the Remaining estimate of the parent issue, specifically a 'Story'.

Steps to Reproduce

1. Create a sprint, without starting it.
2. Add 'Story' issues to the sprint.
3. Go to Backlog, on one of the issues in the new sprint, right click and choose the option 'Split issue'
4. On the pop-up change the remaining estimate of the Parent issue and click out of the 'Remaining' textbox.

Expected Behavior

• You are able to continue writing other information and split the issue.

Actual Behavior

• You get an error : which, after expanding shows this:

Cause

• Unknown.

Workaround

• None

Notes:

• Browser independent.
• After receiving the error, you are still able to split the issue, but it is unclear what effect does this error have.