Firebase "previous value was empty "

hey community
i made an app

while testing i got an error " previous value is empty " i searched this in community and nothing found helpful i saw and did many thing but no use . any one can help.

aia =
boss_world.aia (124.3 KB)

When you are getting this error?

You need to create an empty list first, you cannot append when there is no list.

While send message button click

How to do it

please tell

Try to add this blocks and see if it works


but what to do if value was not empty


Read This Guide …

1 Like

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.