gives error: command failed: git config --get branch.{branch_name}.merge

Hey there, thanks for this great extension. I was always in need of something like this. But its giving me the following error whenever I try to do some action.

Command failed: git config --get branch.feature/wsdev-435.merge

Attaching a screenshot

Screen_Shot_2018-02-02_at_12.28.43_AM

Let me know how I can help more to resolve this issue. Thanks