IE11 script error in End-User UI

Customer has installed https://github.com/ForgeRock/end-user-ui/releases/tag/6.5.0.13

Chrome and Firefox have no issues.  When customer attempts to use IE11, they see in the browser console:

SCRIPT5007: Object expected
vendor.a62b46f78f75aecd893f.js (6,511963)

Upon further research, customer resolved the issue by downgrading bootstrap-vue.  They found this:

https://github.com/bootstrap-vue/bootstrap-vue/issues/3781

In order to keep support of IE11, we need to review.