diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79d512b4..29536060 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## 3.13.23 - 2022-11-06
+
+- Fixed issue with Oj::Parser extension regarding GC timeing.
+
 ## 3.13.22 - 2022-11-01
 
 - Reorganized Oj::Parser code to allow for parser extensions in C.
diff --git a/ext/oj/parser.c b/ext/oj/parser.c
index a1521038..b800c93d 100644
--- a/ext/oj/parser.c
+++ b/ext/oj/parser.c
@@ -1145,7 +1145,9 @@ static void parser_free(void *ptr) {
     p = (ojParser)ptr;
     buf_cleanup(&p->key);
     buf_cleanup(&p->buf);
-    p->free(p);
+    if (NULL != p->free) {
+        p->free(p);
+    }
     xfree(ptr);
 }
 
@@ -1156,7 +1158,9 @@ static void parser_mark(void *ptr) {
         if (0 != p->reader) {
             rb_gc_mark(p->reader);
         }
-        p->mark(p);
+        if (NULL != p->mark) {
+            p->mark(p);
+        }
     }
 }
 
diff --git a/lib/oj/version.rb b/lib/oj/version.rb
index 96280b6b..1c45ef11 100644
--- a/lib/oj/version.rb
+++ b/lib/oj/version.rb
@@ -1,5 +1,5 @@
 
 module Oj
   # Current version of the module.
-  VERSION = '3.13.22'
+  VERSION = '3.13.23'
 end