<URL: http://bugs.freeciv.org/Ticket/Display.html?id=39715 >

Also reported by [EMAIL PROTECTED] on freeciv-dev list with savegame
and proposed patch:

Re: [Freeciv-Dev] Segfault bug in advance_has_flag in common/tech.c

Committed trunk revision 13640.

Index: server/techtools.c
===================================================================
--- server/techtools.c  (revision 13638)
+++ server/techtools.c  (working copy)
@@ -203,7 +203,8 @@
   remove_obsolete_buildings(plr);
   
   /* Give free rails in every city */
-  if (advance_has_flag(tech_found, TF_RAILROAD)) {
+  if (tech_found != A_FUTURE
+   && advance_has_flag(tech_found, TF_RAILROAD)) {
     upgrade_city_rails(plr, was_discovery);  
   }
   
@@ -303,7 +304,8 @@
     } improvement_iterate_end;
   }
 
-  if (advance_has_flag(tech_found, TF_BONUS_TECH) && was_first) {
+  if (was_first && tech_found != A_FUTURE
+   && advance_has_flag(tech_found, TF_BONUS_TECH)) {
     bonus_tech_hack = TRUE;
   }
   
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