Index: exec.c
==================================================================
--- exec.c
+++ exec.c
@@ -1672,10 +1672,11 @@
   }
   if(busy) goto trig;
   // Cleanup phase
   for(n=0;n<nobjects;n++) if(objects[n] && (objects[n]->oflags&OF_DESTROYED)) objtrash(n);
   if(generation_number<=TY_MAXTYPE) return "Too many generations of objects";
+  if(firstobj==VOIDLINK) return "Game cannot continue with no objects";
   // Finished
   return 0;
 }
 
 const char*init_level(void) {