When using async angular 2 validators in combination with the tab control it throws:
“Expression has changed after it was checked. Previous value: ‘true’. Current value: ‘false’.”
In the plunker I could only reproduce the problem referencing the same formControl. In the real application I don’t do this and also have that problem.
Link to minimally-working plunker that reproduces the issue:
Version of Angular, ng-bootstrap, and Bootstrap: