From 975bcfbe1fb3d7c52273c875394d4693bccaae88 Mon Sep 17 00:00:00 2001
From: Ruben Carlo Benante <rcb@beco.cc>
Date: Fri, 22 May 2026 19:24:42 -0300
Subject: [PATCH] IMPROVES-i10 check sequal for null

---
 cmp11sht.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cmp11sht.c b/cmp11sht.c
index a76cd39..33cadca 100644
--- a/cmp11sht.c
+++ b/cmp11sht.c
@@ -169,6 +169,8 @@ int sequal(char *a, char *b, float thr, float *ratio, char *s1, char *s2)
 {
     int i;
 
+    if(!a || !b || !s1 || !s2 || !ratio) return 3; /* error sentinel */
+
     // remove accents
     asciify(a, s1);
     asciify(b, s2);