diff --git a/ext/simplexml/simplexml.c b/ext/simplexml/simplexml.c
index c941e43ad37b9..4ed41d7587626 100644
--- a/ext/simplexml/simplexml.c
+++ b/ext/simplexml/simplexml.c
@@ -2619,27 +2619,32 @@ PHP_FUNCTION(simplexml_import_dom)
 		RETURN_THROWS();
 	}
 
-	object = Z_LIBXML_NODE_P(node);
-
 	nodep = php_libxml_import_node(node);
 
-	if (nodep) {
-		if (nodep->doc == NULL) {
-			php_error_docref(NULL, E_WARNING, "Imported Node must have associated Document");
-			RETURN_NULL();
-		}
-		if (nodep->type == XML_DOCUMENT_NODE || nodep->type == XML_HTML_DOCUMENT_NODE) {
-			nodep = xmlDocGetRootElement((xmlDocPtr) nodep);
-		}
+	if (!nodep) {
+		zend_argument_type_error(1, "must be of type SimpleXMLElement|DOMNode, %s given", zend_zval_type_name(node));
+		RETURN_THROWS();
+	}
+
+	if (nodep->doc == NULL) {
+		php_error_docref(NULL, E_WARNING, "Imported Node must have associated Document");
+		RETURN_NULL();
+	}
+
+	if (nodep->type == XML_DOCUMENT_NODE || nodep->type == XML_HTML_DOCUMENT_NODE) {
+		nodep = xmlDocGetRootElement((xmlDocPtr) nodep);
 	}
 
-	if (nodep && nodep->type == XML_ELEMENT_NODE) {
+	if (nodep->type == XML_ELEMENT_NODE) {
 		if (!ce) {
 			ce = sxe_class_entry;
 			fptr_count = NULL;
 		} else {
 			fptr_count = php_sxe_find_fptr_count(ce);
 		}
+
+		object = Z_LIBXML_NODE_P(node);
+
 		sxe = php_sxe_object_new(ce, fptr_count);
 		sxe->document = object->document;
 		php_libxml_increment_doc_ref((php_libxml_node_object *)sxe, nodep->doc);
diff --git a/ext/simplexml/simplexml.stub.php b/ext/simplexml/simplexml.stub.php
index 7d56de88e9fec..0363c62d3fdca 100644
--- a/ext/simplexml/simplexml.stub.php
+++ b/ext/simplexml/simplexml.stub.php
@@ -6,7 +6,7 @@ function simplexml_load_file(string $filename, ?string $class_name = SimpleXMLEl
 
 function simplexml_load_string(string $data, ?string $class_name = SimpleXMLElement::class, int $options = 0, string $namespace_or_prefix = "", bool $is_prefix = false): SimpleXMLElement|false {}
 
-function simplexml_import_dom(DOMNode $node, ?string $class_name = SimpleXMLElement::class): ?SimpleXMLElement {}
+function simplexml_import_dom(SimpleXMLElement|DOMNode $node, ?string $class_name = SimpleXMLElement::class): ?SimpleXMLElement {}
 
 class SimpleXMLElement implements Stringable, Countable, RecursiveIterator
 {
diff --git a/ext/simplexml/simplexml_arginfo.h b/ext/simplexml/simplexml_arginfo.h
index 7da3c9f33c608..72f1dc9a32a8c 100644
--- a/ext/simplexml/simplexml_arginfo.h
+++ b/ext/simplexml/simplexml_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: f8ca25a00ae1a5fed436851e88229b503c77bf31 */
+ * Stub hash: 70ace711365bb5e7df3174d4cfe68fb3df34a105 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_TYPE_MASK_EX(arginfo_simplexml_load_file, 0, 1, SimpleXMLElement, MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, filename, IS_STRING, 0)
@@ -18,7 +18,7 @@ ZEND_BEGIN_ARG_WITH_RETURN_OBJ_TYPE_MASK_EX(arginfo_simplexml_load_string, 0, 1,
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_INFO_EX(arginfo_simplexml_import_dom, 0, 1, SimpleXMLElement, 1)
-	ZEND_ARG_OBJ_INFO(0, node, DOMNode, 0)
+	ZEND_ARG_OBJ_TYPE_MASK(0, node, SimpleXMLElement|DOMNode, 0, NULL)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, class_name, IS_STRING, 1, "SimpleXMLElement::class")
 ZEND_END_ARG_INFO()