check for non-null chunk in txt_range_equal()

1 files changed, 1 insertions, 2 deletions

diff --git a/txt.c b/txt.c
index e579d7e..164bf16 100644
--- a/txt.c
+++ b/txt.c
@@ -387,9 +387,8 @@ int txt_range_equal(TxtLoc lo, TxtLoc hi, Str cmp) {
 		Str s = txt_next_chunk(&lo);
 		u32 n = cmp.n - i;
 		if (s.n < n) n = s.n;
-		if (memcmp(s.s, cmp.s + i, n)) {
+		if (s.n > 0 && memcmp(s.s, cmp.s + i, n))
 			return 0;
-		}
 		i += s.n;
 	}
 	return 1;