I know how to fix it.
When you create dynamic card view on your first click then single card view will be created.
On second click 2 card views are created one with value and one with blank. Thats why this error occurs.
You can fix this by deleting previously created card views and re create them on each button click.
No extension needed.
Ohh…thanks for the solution…
I always used dynamic component extension to solve this error. 
I will try it later, 
Arrange your all dynamic components in a procedure and call this procedure whenever necessary.
That’s what I said the whole time.
“Look global count. It is a counter.” 
what will happen if I set global count as counter?
It is already a counter. You were setting it as index. That’s where the error occurred.
Count again…?! 
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