Firebase empty string error

I am using firebase storage and storing the download url in firebase database so i can use in dynamic image component . every time I upload image to firebase storage it is working fine and uploadind the url in firebase database but for some picture it is showing empty string error for some picture there is no problem. Can anybody tell me why its happening?

Please show the related block. The error says the error occurred in the select list item block.

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I am getting this error

And for
I am getting this error

Block which comes first in got value block is causing error i dont understand why