fix using invalid node to concatinate string

diff --git a/src/regparse.c b/src/regparse.c
index 9954bf9a24e0a4952ec98a02aacd9a328d176239..700285469ee864a4a63661abc7a8590da45fc577 100644 (file)
--- a/src/regparse.c
+++ b/src/regparse.c
@@ -7856,7 +7856,7 @@ i_apply_case_fold(OnigCodePoint from, OnigCodePoint to[], int to_len, void* arg)
             ns[n++] = csnode;
           }
           else {
-            r = onig_node_str_cat(csnode, buf, buf + len);
+            r = onig_node_str_cat(ns[n-1], buf, buf + len);
             if (r < 0) goto err_free_ns;
           }
         }