diff -rupN INIT.2011-02-08.clean/src/cmd/ksh93/edit/edit.c INIT.2011-02-08/src/cmd/ksh93/edit/edit.c
--- INIT.2011-02-08.clean/src/cmd/ksh93/edit/edit.c	2012-05-10 12:44:32.651317787 +0100
+++ INIT.2011-02-08/src/cmd/ksh93/edit/edit.c	2012-05-10 12:49:00.804744460 +0100
@@ -1652,7 +1652,7 @@ 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=='#')
@@ -1731,7 +1731,7 @@ 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);
 }