diff --git a/ext/soap/php_schema.c b/ext/soap/php_schema.c
index e93679a55ea39..521c5d0f1d9ed 100644
--- a/ext/soap/php_schema.c
+++ b/ext/soap/php_schema.c
@@ -2261,17 +2261,23 @@ static void schema_type_fixup(sdlCtx *ctx, sdlTypePtr type)
 		schema_content_model_fixup(ctx, type->model);
 	}
 	if (type->attributes) {
-		zend_string *str_key;
-		zend_ulong index;
+		HashPosition pos;
+		zend_hash_internal_pointer_reset_ex(type->attributes, &pos);
 
-		ZEND_HASH_FOREACH_KEY_PTR(type->attributes, index, str_key, attr) {
-			if (str_key) {
+		while ((attr = zend_hash_get_current_data_ptr_ex(type->attributes, &pos)) != NULL) {
+			zend_string *str_key;
+			zend_ulong index;
+
+			if (zend_hash_get_current_key_ex(type->attributes, &str_key, &index, &pos) == HASH_KEY_IS_STRING) {
 				schema_attribute_fixup(ctx, attr);
+				zend_result result = zend_hash_move_forward_ex(type->attributes, &pos);
+				ZEND_ASSERT(result == SUCCESS);
 			} else {
 				schema_attributegroup_fixup(ctx, attr, type->attributes);
-				zend_hash_index_del(type->attributes, index);
+				zend_result result = zend_hash_index_del(type->attributes, index);
+				ZEND_ASSERT(result == SUCCESS);
 			}
-		} ZEND_HASH_FOREACH_END();
+		}
 	}
 }
 
diff --git a/ext/soap/tests/gh12392.phpt b/ext/soap/tests/gh12392.phpt
new file mode 100644
index 0000000000000..8a234ba025be9
--- /dev/null
+++ b/ext/soap/tests/gh12392.phpt
@@ -0,0 +1,28 @@
+--TEST--
+GH-12392 (Segmentation fault on SoapClient::__getTypes)
+--EXTENSIONS--
+soap
+--FILE--
+<?php
+
+$client = new SoapClient(__DIR__ . "/gh12392.wsdl", ['cache_wsdl' => WSDL_CACHE_NONE]);
+echo 'Client created!' . "\n";
+
+$types = $client->__getTypes();
+echo 'Got types!' . "\n";
+
+var_dump($types);
+
+?>
+--EXPECT--
+Client created!
+Got types!
+array(1) {
+  [0]=>
+  string(62) "struct dummy {
+ string foo;
+ string a;
+ string b;
+ string c;
+}"
+}
diff --git a/ext/soap/tests/gh12392.wsdl b/ext/soap/tests/gh12392.wsdl
new file mode 100644
index 0000000000000..5e9a7ea094fb8
--- /dev/null
+++ b/ext/soap/tests/gh12392.wsdl
@@ -0,0 +1,61 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<wsdl:definitions
+  xmlns:xs="http://www.w3.org/2001/XMLSchema"
+  xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
+  xmlns="http://schemas.xmlsoap.org/wsdl/"
+  xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
+  targetNamespace="http://xoev.de/schemata/xzufi/2_2_0">
+  <wsdl:types>
+    <xs:schema xmlns:ns="http://php.net" targetNamespace="http://php.net">
+      <xs:attributeGroup name="c">
+        <xs:attribute name="c" type="string" />
+      </xs:attributeGroup>
+
+      <xs:attributeGroup name="b">
+        <xs:attribute name="b" type="string" />
+      </xs:attributeGroup>
+
+      <xs:attributeGroup name="a">
+        <xs:attribute name="a" type="string" />
+        <xs:attributeGroup ref="ns:b" />
+      </xs:attributeGroup>
+
+      <xs:complexType name="dummy">
+        <xs:sequence>
+          <xs:element name="foo" type="string" />
+        </xs:sequence>
+        <xs:attributeGroup ref="ns:a" />
+        <xs:attributeGroup ref="ns:c" />
+      </xs:complexType>
+    </xs:schema>
+  </wsdl:types>
+
+  <!-- Below is a shortened copy of the test.wsdl, doesn't matter, only the types matter -->
+
+  <message name="AddRequest">
+    <part name="x" type="xs:double" />
+  </message>
+
+  <portType name="TestServicePortType">
+    <operation name="Add">
+      <input message="tns:AddRequest" />
+    </operation>
+  </portType>
+
+  <binding name="TestServiceBinding" type="tns:TestServicePortType">
+    <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http" />
+    <operation name="Add">
+      <soap:operation soapAction="Add" style="rpc" />
+      <input>
+        <soap:body use="encoded" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" />
+      </input>
+    </operation>
+  </binding>
+
+  <service name="TestService">
+    <port name="TestServicePort" binding="tns:TestServiceBinding">
+      <soap:address location="http://linuxsrv.home/~dmitry/soap/soap_server.php" />
+    </port>
+  </service>
+
+</wsdl:definitions>