From 42e85122181662a8a5c48b534efd642088960b26 Mon Sep 17 00:00:00 2001
From: Friedemann Kleint <Friedemann.Kleint@qt.io>
Date: Wed, 25 Oct 2023 14:39:43 +0200
Subject: Fix crashes related to broken QML decorators

Task-number: PYSIDE-2432
Change-Id: I0108c944ce07e28f1af93a3f2adf51ebd76e92c4
Reviewed-by: Adrian Herrmann <adrian.herrmann@qt.io>
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>
(cherry picked from commit 3b086f648a2387989ff21f90660dca1404f7f734)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 02dfdfd61b99eb5780d1604c963f7e95d5b086ee)
---
 sources/shiboken6/libshiboken/sbkfeature_base.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sources/shiboken6/libshiboken/sbkfeature_base.cpp b/sources/shiboken6/libshiboken/sbkfeature_base.cpp
index 1242cbda4..662e9276d 100644
--- a/sources/shiboken6/libshiboken/sbkfeature_base.cpp
+++ b/sources/shiboken6/libshiboken/sbkfeature_base.cpp
@@ -185,6 +185,9 @@ static PyObject *replaceNoArgWithZero(PyObject *callable)
 
 static PyObject *lookupUnqualifiedOrOldEnum(PyTypeObject *type, PyObject *name)
 {
+    // MRO has been observed to be 0 in case of errors with QML decorators
+    if (type == nullptr || type->tp_mro == nullptr)
+        return nullptr;
     static PyTypeObject *const EnumMeta = getPyEnumMeta();
     static PyObject *const _member_map_ = String::createStaticString("_member_map_");
     // This is similar to `find_name_in_mro`, but instead of looking directly into
-- 
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