TraceTreeItem: Added valid owner assert to drag_by

diff --git a/pv/view/tracetreeitem.cpp b/pv/view/tracetreeitem.cpp
index fa11e292a7a2ae655fb36502db6fa5ec80cdbeb5..89bf466788224bb2518abc2fb3f3c9370e11ce6c 100644 (file)
--- a/pv/view/tracetreeitem.cpp
+++ b/pv/view/tracetreeitem.cpp
@@ -122,6 +122,7 @@ int TraceTreeItem::get_visual_y() const
 
 void TraceTreeItem::drag_by(const QPoint &delta)
 {
+       assert(owner_);
        force_to_v_offset(drag_point_.y() + delta.y() -
                owner_->owner_visual_v_offset());
 }