[Commands & Colors: Napoleonics V5] IllegalArgumentException: Piece is not on this map

[uckelman]

ABR
Version	3.7.15
Reporter	[email protected]
Error Log	2233091 bytes

Replaying a log.
Undid a couple of steps, started logging.
Redid two steps and closed log.
Tried drags a piece (card) on the main map -> Exception (java.lang.IllegalArgumentException: Piece is not on this map).

Commands & Colors: Napoleonics V5 v5.1.0a1100 3.7.15

java.lang.IllegalArgumentException: Piece is not on this map
 at VASSAL.build.module.Map.positionOf(Map.java:2577)
 at VASSAL.build.module.map.MenuDisplayer.maybePopup(MenuDisplayer.java:274)
 at VASSAL.build.module.map.MenuDisplayer.mouseReleased(MenuDisplayer.java:248)
 at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297)

[riverwanderer]

Short log file leaving module in state prior to the exception: here.

It appears that when dragged the card (Superb Infantry Training) has a null OldMap (and presumably, before dragging, CurrentMap is also null). This issue seems to be associated with logfile or undo operations or both. The same actions work find normally in the original play or when reading the logfile.

Log file may be viewed using C&C Napoleonics v5.1.0 (beta10 or later).