Firebase got value component retrieves null value

my firebase

my blocks

the result

what it retrieves null ?

Just guessing:
because you use number as tag? Here number is considered as an index in a list. and the index is counting from 0, so, you have a null, since you did not specify index 0.

try a String as tag please.

sir you are absolutely correct.
But the tag must be counting numbers. when anybody message then the counting number will automatically increased by 1. is there any alternative method to get rid of null?

Either start at 0 to use firebase arrays, or add a 0 to 1 to make 01

starting with 0 works fine.

You may want to read this:

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