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-rw-r--r--seq.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/seq.c b/seq.c
index 2402875..a2648bf 100644
--- a/seq.c
+++ b/seq.c
@@ -268,6 +268,9 @@ blaze822_seq_next(char *map, char *range, struct blaze822_seq_iter *iter)
 		iter->line = 1;
 	}
 
+	if (!iter->s)
+		return 0;
+
 	while (iter->line < iter->start) {
 		char *t = strchr(iter->s, '\n');
 		if (!t)