My bot made an erorr

[JDA MainWS-ReadThread] ERROR JDA - One of the EventListeners had an uncaught exception java.lang.NullPointerException at Systems.test.onButtonInteraction(test.java:330) at net.dv8tion.jda.api.hooks.ListenerAdapter.onEvent(ListenerAdapter.java:382) at net.dv8tion.jda.api.hooks.InterfacedEventManager.handle(InterfacedEventManager.java:96) at net.dv8tion.jda.internal.hooks.EventManagerProxy.handleInternally(EventManagerProxy.java:88) at net.dv8tion.jda.internal.hooks.EventManagerProxy.handle(EventManagerProxy.java:70) at net.dv8tion.jda.internal.JDAImpl.handleEvent(JDAImpl.java:172) at net.dv8tion.jda.internal.handle.InteractionCreateHandler.handleAction(InteractionCreateHandler.java:132) at net.dv8tion.jda.internal.handle.InteractionCreateHandler.handleInternally(InteractionCreateHandler.java:84) at net.dv8tion.jda.internal.handle.SocketHandler.handle(SocketHandler.java:39) at net.dv8tion.jda.internal.requests.WebSocketClient.onDispatch(WebSocketClient.java:960) at net.dv8tion.jda.internal.requests.WebSocketClient.onEvent(WebSocketClient.java:846) at net.dv8tion.jda.internal.requests.WebSocketClient.handleEvent(WebSocketClient.java:824) at net.dv8tion.jda.internal.requests.WebSocketClient.onBinaryMessage(WebSocketClient.java:999) at com.neovisionaries.ws.client.ListenerManager.callOnBinaryMessage(ListenerManager.java:385) at com.neovisionaries.ws.client.ReadingThread.callOnBinaryMessage(ReadingThread.java:276) at com.neovisionaries.ws.client.ReadingThread.handleBinaryFrame(ReadingThread.java:996) at com.neovisionaries.ws.client.ReadingThread.handleFrame(ReadingThread.java:755) at com.neovisionaries.ws.client.ReadingThread.main(ReadingThread.java:108) at com.neovisionaries.ws.client.ReadingThread.runMain(ReadingThread.java:64) at com.neovisionaries.ws.client.WebSocketThread.run(WebSocketThread.java:45)