0.49.10: Uncaught NPE When Opening In Use Socket

[Windchild292]

10:32:50,392 ERROR [megamek.client.ui.swing.MegaMekGUI] {AWT-EventQueue-0}
megamek.client.ui.swing.MegaMekGUI.startServer(MegaMekGUI.java:450) - Could not create server socket on port 2346
java.net.BindException: Address already in use: NET_Bind
   at java.base/java.net.PlainSocketImpl.bind0(Native Method)
   at java.base/java.net.PlainSocketImpl.socketBind(PlainSocketImpl.java:132)
   at java.base/java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:436)
   at java.base/java.net.ServerSocket.bind(ServerSocket.java:381)
   at java.base/java.net.ServerSocket.<init>(ServerSocket.java:243)
   at java.base/java.net.ServerSocket.<init>(ServerSocket.java:135)
   at megamek.server.Server.<init>(Server.java:335)
   at megamek.client.ui.swing.MegaMekGUI.startServer(MegaMekGUI.java:446)
   at megamek.client.ui.swing.MegaMekGUI.startHost(MegaMekGUI.java:405)
   at megamek.client.ui.swing.MegaMekGUI.host(MegaMekGUI.java:397)
   at megamek.client.ui.swing.MegaMekGUI.lambda$new$0(MegaMekGUI.java:923)
   at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
   at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
   at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
   at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
   at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279)
   at java.desktop/java.awt.Component.processMouseEvent(Component.java:6632)
   at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
   at megamek.client.ui.swing.widget.MegamekButton.processMouseEvent(MegamekButton.java:242)
   at java.desktop/java.awt.Component.processEvent(Component.java:6397)
   at java.desktop/java.awt.Container.processEvent(Container.java:2263)
   at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5008)
   at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
   at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840)
   at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
   at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
   at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
   at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
   at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
   at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840)
   at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
   at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
   at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
   at java.base/java.security.AccessController.doPrivileged(Native Method)
   at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
   at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
   at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
   at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
   at java.base/java.security.AccessController.doPrivileged(Native Method)
   at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
   at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
   at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
   at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
   at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
   at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
   at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

10:32:51,512 ERROR [megamek.MegaMek] {AWT-EventQueue-0}
megamek.MegaMek.lambda$main$0(MegaMek.java:61) - Uncaught Exception Detected
java.lang.NullPointerException
   at megamek.client.ui.swing.MegaMekGUI.startHost(MegaMekGUI.java:406)
   at megamek.client.ui.swing.MegaMekGUI.host(MegaMekGUI.java:397)
   at megamek.client.ui.swing.MegaMekGUI.lambda$new$0(MegaMekGUI.java:923)
   at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
   at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
   at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
   at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
   at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279)
   at java.desktop/java.awt.Component.processMouseEvent(Component.java:6632)
   at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
   at megamek.client.ui.swing.widget.MegamekButton.processMouseEvent(MegamekButton.java:242)
   at java.desktop/java.awt.Component.processEvent(Component.java:6397)
   at java.desktop/java.awt.Container.processEvent(Container.java:2263)
   at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5008)
   at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
   at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840)
   at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
   at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
   at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
   at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
   at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
   at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840)
   at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
   at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
   at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
   at java.base/java.security.AccessController.doPrivileged(Native Method)
   at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
   at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
   at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
   at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
   at java.base/java.security.AccessController.doPrivileged(Native Method)
   at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
   at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
   at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
   at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
   at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
   at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
   at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)