--- param/loadparm.c.orig	Fri Aug 25 13:40:09 2006
+++ param/loadparm.c	Fri Aug 25 13:46:28 2006
@@ -3852,7 +3852,7 @@
 
 BOOL dump_a_parameter(int snum, char *parm_name, FILE * f, BOOL isGlobal)
 {
-	service * pService = ServicePtrs[snum];
+	service * pService = NULL;
 	int i;
 	BOOL result = False;
 	parm_class p_class;
@@ -3883,8 +3883,13 @@
 	if (isGlobal) {
 		p_class = P_GLOBAL;
 		flag = FLAG_GLOBAL;
-	} else
+	} else {
+		if (!VALID_SNUM(snum)) {
+			return False;
+		}
+		pService = ServicePtrs[snum];
 		p_class = P_LOCAL;
+	}
 
 	for (i = 0; parm_table[i].label; i++) {
 		if (strwicmp(parm_table[i].label, parm_name) == 0 &&