Bug in Git Gui create branch

Not sure what are the prerequisites for creating this bug, but it just suddenly happened to me that I cannot create branches.

bad window path name ".__branch_create____o1____d.desc.name_t"
bad window path name ".__branch_create____o1____d.desc.name_t"
     while executing
"focus $old_focus"
     (procedure "choose_rev::_sb_set" line 10)
     invoked from within
"choose_rev::_sb_set ::choose_rev::__o1::__d 
.__branch_create____o1____d.rev.list.sby v 0.0 1.0"
     (vertical scrolling command executed by listbox)

I pasted the error log here as well as attach the file.

Regards, Jay

bad window path name ".__branch_create____o1____d.desc.name_t"
bad window path name ".__branch_create____o1____d.desc.name_t"
    while executing
"focus $old_focus"
    (procedure "choose_rev::_sb_set" line 10)
    invoked from within
"choose_rev::_sb_set ::choose_rev::__o1::__d .__branch_create____o1____d.rev.list.sby v 0.0 1.0"
    (vertical scrolling command executed by listbox)