How can set a limit to adding an app block if one has already been added

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Shopify Partner
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I have created a custom app-block specifically for the product section.

 

I added DeppLink to enable the app-block on the product section. It was successfully enabled but the issue is that every time I click on the DeepLink or add it from the theme customize, it adds another app-block. So, instead of updating the existing one, it keeps adding more and more. like this 

 

Agnesh's Store · Customize Refresh · Shopify.png

 

I want to check if the app-block was added to the product section.

 

How can I achieve this, have any idea for this issue?

 
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