diff --git a/NEWS b/NEWS
index 99781c8c652..1c1cf6acae6 100644
--- a/NEWS
+++ b/NEWS
@@ -2,7 +2,11 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? ????, PHP 8.3.13
 
-- Opcache:
+- SimpleXML:
+  . Fixed bug GH-15837 (Segmentation fault in ext/simplexml/simplexml.c).
+    (nielsdos)
+
+- SOAP:
   . Fixed bug #73182 (PHP SOAPClient does not support stream context HTTP
     headers in array form). (nielsdos)
   . Fixed bug #62900 (Wrong namespace on xsd import error message). (nielsdos)
diff --git a/ext/simplexml/simplexml.c b/ext/simplexml/simplexml.c
index 1047fb4f19c..e0c1bf7926e 100644
--- a/ext/simplexml/simplexml.c
+++ b/ext/simplexml/simplexml.c
@@ -2540,6 +2540,11 @@ static void php_sxe_iterator_current_key(zend_object_iterator *iter, zval *key)
 {
 	php_sxe_iterator *iterator = (php_sxe_iterator *)iter;
 	zval *curobj = &iterator->sxe->iter.data;
+	if (Z_ISUNDEF_P(curobj)) {
+		ZVAL_NULL(key);
+		return;
+	}
+
 	php_sxe_object *intern = Z_SXEOBJ_P(curobj);
 
 	xmlNodePtr curnode = NULL;
diff --git a/ext/simplexml/tests/gh15837.phpt b/ext/simplexml/tests/gh15837.phpt
new file mode 100644
index 00000000000..302db064ee0
--- /dev/null
+++ b/ext/simplexml/tests/gh15837.phpt
@@ -0,0 +1,30 @@
+--TEST--
+GH-15837 (Segmentation fault in ext/simplexml/simplexml.c)
+--CREDITS--
+YuanchengJiang
+--FILE--
+<?php
+$xml =<<<EOF
+<xml>
+<fieldset1>
+</fieldset1>
+<fieldset2>
+<options>
+</options>
+</fieldset2>
+</xml>
+EOF;
+$sxe = new SimpleXMLIterator($xml);
+$rit = new RecursiveIteratorIterator($sxe, RecursiveIteratorIterator::LEAVES_ONLY);
+foreach ($rit as $child) {
+    $ancestry = $child->xpath('ancestor-or-self::*');
+    // Exhaust internal iterator
+    foreach ($ancestry as $ancestor) {
+    }
+}
+var_dump($rit->valid());
+var_dump($rit->key());
+?>
+--EXPECT--
+bool(false)
+NULL