[ruby/strscan] Sync missed commit

Syncs commit ruby/strscan@76b377a5d875ec77282d9319d62d8f24fe283b40.

1 files changed, 3 insertions, 1 deletions

diff --git a/ext/strscan/strscan.c b/ext/strscan/strscan.c
index f7888e2cf1..9f24287e35 100644
--- a/ext/strscan/strscan.c
+++ b/ext/strscan/strscan.c
@@ -1502,7 +1502,9 @@ strscan_named_captures(VALUE self)
     named_captures_data data;
     data.self = self;
     data.captures = rb_hash_new();
-    onig_foreach_name(RREGEXP_PTR(p->regex), named_captures_iter, &data);
+    if (!RB_NIL_P(p->regex)) {
+        onig_foreach_name(RREGEXP_PTR(p->regex), named_captures_iter, &data);
+    }
 
     return data.captures;
 }