If tag changed once, can't change tag anymore??

eat small one-> change the color of player(the big oval one) and change the color and tag other small circle

Changing the color of player is okay. but change the color and tag other small circle It works once, but twice or more, not works.

Sorry for baaaaaaaaaaaaaad English. but I don’t know what to do…

Help me plz

It’s not the problem if you can’t change the tag, the problem is whether that this is already been destroyed or not. First, check whether this is already destroyed or not before going with this.tag == "Black_dew" ← that line triggers the error, right?

or put a check whether that StageDewChange has destroyed or not before calling dewchange()