How to fix 'Parameter Missing or Invalid' errors on certain products?

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When adding an item to the cart, we have encountered the error Parameter Missing or Invalid: Required parameter missing or invalid. But only concerning some products such as these with variants.

Other than here described, the ID is correct

The Theme developer says it its caused by custom codes or apps.
But we didn´t activate new one since the error occurs.

Product page with error: e.g.

Can somebody help out?
Thanks in advance
2023-07-07 11_08_16-Parameter Missing or Invalid.png

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