NPE with Space Battle - megamek.client.ui.swing.MovementDisplay.updateConvertModeButton(MovementDisplay.java:2798)

[HammerGS]

Sent this from Compass with Hat on Discord. Relates to space battle.

Environment

What version of MegaMek does your issue apply to? 49.18

megamek.log
Gamelog and Save.zip

Errors in Log a couple of times

6:36:06,894 ERROR [megamek.MegaMek] {AWT-EventQueue-0}
megamek.MegaMek.lambda$main$0(MegaMek.java:63) - Uncaught Exception Detected
java.lang.NullPointerException
	at megamek.client.ui.swing.MovementDisplay.updateConvertModeButton(MovementDisplay.java:2798)
	at megamek.client.ui.swing.MovementDisplay.hexMoused(MovementDisplay.java:2231)
	at megamek.client.ui.swing.boardview.BoardView.processBoardViewEvent(BoardView.java:966)
	at megamek.client.ui.swing.boardview.BoardView.mouseAction(BoardView.java:4899)
	at megamek.client.ui.swing.boardview.BoardView.mouseAction(BoardView.java:4931)
	at megamek.client.ui.swing.boardview.BoardView.mouseReleased(BoardView.java:4653)
	at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297)
	at java.desktop/java.awt.Component.processMouseEvent(Component.java:6635)
	at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)