diff --git a/src/player.c b/src/player.c
index 2f2ac9b..e0c8e27 100644
--- a/src/player.c
+++ b/src/player.c
@@ -1584,6 +1584,7 @@ int player_missionAlreadyDone(int id) {
 /* Save the player in a freaking xmlfile. */
 int player_save(xmlTextWriterPtr writer) {
   int i;
+  MissionData* m;
 
   xmlw_startElem(writer, "player");
   xmlw_attr(writer, "name", player_name);
@@ -1601,10 +1602,14 @@ int player_save(xmlTextWriterPtr writer) {
 
   xmlw_endElem(writer); /* Player. */
 
+  /* Mission the player has done. */
   xmlw_startElem(writer, "missions_done");
 
-  for(i = 0; i < missions_ndone; i++)
-    xmlw_elem(writer, "done", mission_get(missions_done[i])->name);
+  for(i = 0; i < missions_ndone; i++) {
+    m = mission_get(missions_done[i]);
+    if(m != NULL) /* In case mission name changes between versions. */
+      xmlw_elem(writer, "done", mission_get(missions_done[i])->name);
+  }
 
   xmlw_endElem(writer); /* missions_done. */