ERROR: expected String to be a id: id shopify on first product of each collection

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I need urgent help!. 

The first product of each collection show this error "expected String to be a id: id " when I am adding product to cart. 
I am using Dudu Theme and site link is mentioned below:     https://3g5w6bglrhmqhku4-26380348.shopifypreview.com

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