--- src/cmd/ksh93/edit/edit.c
+++ src/cmd/ksh93/edit/edit.c	2012-01-16 16:13:59.743144345 +0100
@@ -1670,7 +1670,7 @@ 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=0, **av, **ar;
 	if(!(hp=ep->sh->gd->hist_ptr))
 		return(0);
 	if(*pattern=='#')
@@ -1748,8 +1748,13 @@ int ed_histgen(Edit_t *ep,const char *pa
 			mplast->next = mp;
 		mplast->next = 0;
 	}
-	ep->hlist = (Histmatch_t**)argv;
-	ep->hfirst = ep->hlist?ep->hlist[0]:0;
+	if (argv)
+	{
+		ep->hlist = (Histmatch_t**)argv;
+		ep->hfirst = ep->hlist?ep->hlist[0]:0;
+	}
+	else
+		ep->hfirst = 0;
 	return(ep->hmax=ac);
 }