[Technical] xapi Statements solve console errors

Technical

xapi Statements throwh various errors in the Frontend console. Find out why and try to solve them.

Definition of Done

[ ] All acceptance criteria are met
[ ] The implementation of the User Story has been successfully accepted by the Product Owner
[ ] The implementation is in GitHub
[ ] A code review has been performed (or created in pairing program)
[ ] Code conventions are followed
[ ] Unit test coverage must be greater than 90%
[ ] All tests must have passed
[ ] Technical documentation created (Feature documented in GitHub Wiki)
[ ] UML class diagrams and component diagrams created and up-to-date
[ ] Documentation in realization created (source code)
[ ] Changelog created (Clear description in merge request)
[ ] There are no known bugs
[ ] Rendering behaviour is optimized

HASKI-RAK / HASKI-Frontend