Fri Jun 23 15:48:34 2006  Arnold D. Robbins  <arnold@skeeve.com>

    * awkgram.y (subn): At end for `do_sprintf' check, verify that lnode is not NULL
    before using it assign through.

--- gawk-3.1.5/awkgram.y.syntaxerror	2005-07-26 20:07:43.000000000 +0200
+++ gawk-3.1.5/awkgram.y	2006-06-23 17:43:55.000000000 +0200
@@ -2399,7 +2399,8 @@
 	r->subnode = subn;
 	if (r->builtin == do_sprintf) {
 		count_args(r);
-		r->lnode->printf_count = r->printf_count; /* hack */
+		if (r->lnode != NULL)	/* r->lnode set from subn. guard against syntax errors & check it's valid */
+			r->lnode->printf_count = r->printf_count; /* hack */
 	}
 	return r;
 }