I am seeing the below error and warning in Console when I try to display a View. I have tried deactivating all plugins etc but the problem still exists.
Error:
Uncaught TypeError: Cannot read property 'indexOf' of undefined
Warning:
jQuery.Deferred exception: Cannot read property 'indexOf' of undefined TypeError: Cannot read property 'indexOf' of undefined
I have now managed to solve this problem myself, but thank you for your offer of help.
I believe the issue was something to do with the way I am manually enqueuing Bootstrap 4. I rewrote the related functions and the problem seems to have been solved.