java.lang.NullPointerException: This exception has no message.

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Made a code for a simple chat and it worked, made similar thing in android studio and it didn't work, what's wrong?

This exception has no message.

java.lang.NullPointerException	at com.ilya.rabinovich.tictactoe.MiniServer.sendToClient(MiniServer.java:138)	at com.ilya.rabinovich.tictactoe.MiniServer.run(MiniServer.java:75)