I can't use the http://go.atlassian.com/ak-sandbox with IE11 because it throws an error.
If I use 6.5.2 version it fails but, I tried to change the version of the @atlaskit/icon to 8.0.1 and it works, great!!!
But I've found another problem that it seems generated by the same thing.
I'm using @atlaskit/field-base to create custom fields formatted as the atlaskit ones, and FieldBase throws the same error in the console. I've searched in the FieldBase sources and I've found that the version 7.4.4 (latest) uses the @email@example.com