Error on subtracting variables '1.50' and '0.00' due to mismatch of types

Error on subtracting variables '1.50' and '0.00' due to mismatch of types

I have a subform where users can add rows and in the rows articles for sale
But for example if a row is not filled and the user wants to delete the row again by the delete button I get the error notification: Error on subtracting variables '1.50' and '0.00' due to mismatch of types

Hope somebody can help me.

With kind regards

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