diff --git a/ext/dom/php_dom.c b/ext/dom/php_dom.c
index 27ec683910057..55779f2e9ba06 100644
--- a/ext/dom/php_dom.c
+++ b/ext/dom/php_dom.c
@@ -600,7 +600,9 @@ static zend_object *dom_objects_store_clone_obj(zend_object *zobject) /* {{{ */
 			if (cloned_node != NULL) {
 				dom_update_refcount_after_clone(intern, node, clone, cloned_node);
 			}
-			clone->document->private_data = php_dom_libxml_ns_mapper_header(ns_mapper);
+			if (ns_mapper != NULL) {
+				clone->document->private_data = php_dom_libxml_ns_mapper_header(ns_mapper);
+			}
 		}
 	}
 
diff --git a/ext/dom/tests/gh14652.phpt b/ext/dom/tests/gh14652.phpt
new file mode 100644
index 0000000000000..2203bbbca1a0b
--- /dev/null
+++ b/ext/dom/tests/gh14652.phpt
@@ -0,0 +1,18 @@
+--TEST--
+GH-14652 segfault on object cloning
+--EXTENSIONS--
+dom
+--CREDITS--
+YuanchengJiang
+--FILE--
+<?php
+$attr = new DOMAttr('category', 'books');
+$clone = clone $attr;
+$attr->value = "hello";
+
+var_dump($attr->value);
+var_dump($clone->value);
+?>
+--EXPECT--
+string(5) "hello"
+string(5) "books"