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

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java.lang.NullPointerException:
at Commands.PingCommand.action(PingCommand.java:19)
at undefined.Bot1.handleCommand(Bot1.java:41)
at net.dv8tion.jda.hooks.ListenerAdapter.onEvent(ListenerAdapter.java:176)
at net.dv8tion.jda.hooks.InterfacedEventManager.handle(InterfacedEventManager.java:57)
at net.dv8tion.jda.handle.MessageReceivedHandler.handleInternally(MessageReceivedHandler.java:65)
at net.dv8tion.jda.handle.SocketHandler.handle(SocketHandler.java:36)
at net.dv8tion.jda.requests.WebSocketClient.handleEvent(WebSocketClient.java:545)
at net.dv8tion.jda.requests.WebSocketClient.onTextMessage(WebSocketClient.java:296)
at com.neovisionaries.ws.client.ListenerManager.callOnTextMessage(ListenerManager.java:352)
at com.neovisionaries.ws.client.ReadingThread.callOnTextMessage(ReadingThread.java:233)
at com.neovisionaries.ws.client.ReadingThread.callOnTextMessage(ReadingThread.java:211)
at com.neovisionaries.ws.client.ReadingThread.handleTextFrame(ReadingThread.java:910)
at com.neovisionaries.ws.client.ReadingThread.handleFrame(ReadingThread.java:693)
at com.neovisionaries.ws.client.ReadingThread.main(ReadingThread.java:102)

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