Burger Menu doesn't work on mobile devices (since about 2 weeks)

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Hi everyone,

you can find our shop on https://karlsruhe-copyshop.de/

If someone visits our shop on a mobile device the burger menu doesn't work proper. If you choose "Drucken" in the burger menu and want to go even further via the links "Abschlussarbeiten", "Lernmaterialien", "Weitere Drucksachen" or "Extras & Zubehör" there is an error:


The other menu links such as "Tipps zum Druck" followed by "Kostenloser Layout Check" seem to work just fine.

Do you know what is causing the error? We are going to deinstall some apps that are not in use tomorrow and I am very thankful for any further hints.

Best Regards