1 files changed, 1 insertions, 1 deletions
diff --git a/src/scanners.re b/src/scanners.re
index befe7d0..8176590 100644
--- a/src/scanners.re
+++ b/src/scanners.re
@@ -7,7 +7,7 @@ bufsize_t _scan_at(bufsize_t (*scanner)(const unsigned char *), cmark_chunk *c,
 	bufsize_t res;
 	unsigned char *ptr = (unsigned char *)c->data;
 
-        if (ptr == NULL) {
+        if (ptr == NULL || offset > c->len) {
           return 0;
         } else {
 	  unsigned char lim = ptr[c->len];