diff --git a/libs/piqt_utils/pivaluetree_edit.h b/libs/piqt_utils/pivaluetree_edit.h
index dc344aa..eb378a0 100644
--- a/libs/piqt_utils/pivaluetree_edit.h
+++ b/libs/piqt_utils/pivaluetree_edit.h
@@ -144,7 +144,7 @@ private:
 	PIMap<PIString, PIValueTreeEdit *> tree_edits;
 	PIMap<PIString, QLabel *> comm_labels, label_labels;
 	QTabWidget * tab_widget = nullptr;
-	Ui::PIValueTreeEditArray * ui_array;
+	Ui::PIValueTreeEditArray * ui_array = nullptr;
 	GridWidgets * grid    = nullptr;
 	Grouping cur_grouping = Parent, real_grouping = Indent;
 	mutable PIValueTree source, current;