If you are using boostrap 4 alpha and having issues with tooltip and transitions with modal that hangs on transtion, check the following solution. Usually you will get the following errors:

• Error: Modal is transitioning.
• Error: Tooltip is transitioning.

Solution 1

You could try to remove the 'fade' class on modals.

Solution 2

If removing the fade don't works or you want to try another solution, add the data-animation="false" to your html elements. Setting data-animation="false" on the elements having the data-toggle attribute to solved the issue.