push und pop verwechselt

src/common/gamecode/study.c

@@ -411,7 +411,7 @@ teach(unit * u, struct order * ord)
       init_tokens(u2->thisorder);
       skip_token();
       sk = getskill(u2->faction->locale);
-      parser_pushstate();
+      parser_popstate();
 
       if (sk == NOSKILL) {
         add_message(&u->faction->msgs,

src/common/kernel/save.c

@@ -489,6 +489,7 @@ unitorders(FILE * F, struct faction * f)
         order * ord = *ordp;
         if (!is_repeated(ord)) {
           *ordp = ord->next;
+          ord->next = NULL;
           free_order(ord);
         } else {
           ordp = &ord->next;