Invoke: no method named `ClearList' in class java.lang.Boolean

hi all guys, I have a chat and when I close the connection with a user to return to the list of users it gives me the error:

invoke: no method named `ClearList 'in class java.lang.Boolean

Can you tell me what it can depend on?

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@Gian_Luca Show your blocks where you are calling the list of users after the connection is closed