After running into the same issue mentioned in https://github.com/thenikso/angular-flexslider/issues/53, I found the fix in my case was to make sure we're checking the old collection of slides for the element to the remove. When using the new collection, the value was no longer present, causing the error.
After running into the same issue mentioned in https://github.com/thenikso/angular-flexslider/issues/53, I found the fix in my case was to make sure we're checking the old collection of slides for the element to the remove. When using the new collection, the value was no longer present, causing the error.