diff --git a/src/designer/src/components/propertyeditor/designerpropertymanager.cpp b/src/designer/src/components/propertyeditor/designerpropertymanager.cpp
index 8edd361da65096fb6578483925f7ee66c43e18b1..28104439d8daa397817949cbfe4736fe6539890e 100644
--- a/src/designer/src/components/propertyeditor/designerpropertymanager.cpp
+++ b/src/designer/src/components/propertyeditor/designerpropertymanager.cpp
@@ -897,6 +897,7 @@ DesignerPropertyManager::DesignerPropertyManager(QDesignerFormEditorInterface *c
     QtVariantPropertyManager(parent),
     m_changingSubValue(false),
     m_core(core),
+    m_object(nullptr),
     m_sourceOfChange(0)
 {
     connect(this, &QtVariantPropertyManager::valueChanged,