Attempted to read an unowned reference but object ... was already deallocated

[IAntolK]

I've got a crash when was trying to write data to UDP socket:
try socket.write(from: data, to: senderAddress).
Error occurred at: Socket.swift - line 3211.
You are using unowned self which results with "Attempted to read an unowned reference but object ... was already deallocated" error if socket object is deallocated before write completes.
Possible solution would be to use [weak self].