diff --git a/ext/libxml/libxml.c b/ext/libxml/libxml.c
index e53746379428..489dea577105 100644
--- a/ext/libxml/libxml.c
+++ b/ext/libxml/libxml.c
@@ -1137,6 +1137,9 @@ PHP_FUNCTION(libxml_use_internal_errors)
 			zend_llist_destroy(LIBXML(error_list));
 			efree(LIBXML(error_list));
 			LIBXML(error_list) = NULL;
+			/* libxml_get_last_error() falls back to libxml's own last error
+			 * once the list is gone, so it must not outlive the cleared list. */
+			xmlResetLastError();
 		}
 	} else {
 		xmlSetStructuredErrorFunc(NULL, php_libxml_structured_error_handler);
diff --git a/ext/libxml/tests/libxml_use_internal_errors_clears_last_error.phpt b/ext/libxml/tests/libxml_use_internal_errors_clears_last_error.phpt
new file mode 100644
index 000000000000..a0a40d100a63
--- /dev/null
+++ b/ext/libxml/tests/libxml_use_internal_errors_clears_last_error.phpt
@@ -0,0 +1,29 @@
+--TEST--
+libxml_use_internal_errors(false) clears the last error
+--EXTENSIONS--
+libxml
+dom
+--FILE--
+<?php
+
+libxml_use_internal_errors(true);
+
+$document = new DOMDocument();
+$document->loadXML('<a><b></a>');
+
+var_dump(count(libxml_get_errors()) > 0);
+var_dump(libxml_get_last_error() instanceof LibXMLError);
+
+var_dump(libxml_use_internal_errors(false));
+
+var_dump(libxml_get_errors());
+var_dump(libxml_get_last_error());
+
+?>
+--EXPECT--
+bool(true)
+bool(true)
+bool(true)
+array(0) {
+}
+bool(false)