diff -ru -X /home/jjm/cvs/no.freeciv FreecivCVS/ai/aiunit.c freeciv/ai/aiunit.c
--- FreecivCVS/ai/aiunit.c	Mon Feb 28 16:37:25 2000
+++ freeciv/ai/aiunit.c	Wed Mar  1 01:22:16 2000
@@ -754,6 +754,7 @@
               }
             unit_list_iterate_end; /* passengers are safely stowed away */
             do_unit_goto(pplayer, ferryboat, GOTO_MOVE_ANY);
+	    if (!unit_list_find(&pplayer->units, boatid)) return(-1); /* died */
             set_unit_activity(punit, ACTIVITY_IDLE);
           } /* else wait, we can GOTO later. */
         }