diff -up ksh-20110630/src/cmd/ksh93/edit/edit.c.histfix ksh-20110630/src/cmd/ksh93/edit/edit.c
--- ksh-20110630/src/cmd/ksh93/edit/edit.c.histfix	2011-03-03 16:20:03.000000000 +0100
+++ ksh-20110630/src/cmd/ksh93/edit/edit.c	2011-12-07 15:55:50.576089698 +0100
@@ -1655,7 +1655,7 @@ int ed_histgen(Edit_t *ep,const char *pa
 	History_t	*hp;
 	off_t		offset;
 	int 		ac=0,l,m,n,index1,index2;
-	char		*cp, **argv, **av, **ar;
+	char		*cp, **argv=NULL, **av, **ar;
 	if(!(hp=ep->sh->gd->hist_ptr))
 		return(0);
 	if(*pattern=='#')
@@ -1734,7 +1734,7 @@ int ed_histgen(Edit_t *ep,const char *pa
 		mplast->next = 0;
 	}
 	ep->hlist = (Histmatch_t**)argv;
-	ep->hfirst = ep->hlist[0];
+	ep->hfirst = ep->hlist ? ep->hlist[0] : NULL;
 	return(ep->hmax=ac);
 }