From 3f8dc1a5a8588ddc90910423cef584ea835030e5 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Tue, 19 Jul 2022 10:40:32 +0200
Subject: [PATCH] Gui: fix crash in
 ViewProviderLink::currentDraggingPlacement() if there is no active dragger

---
 src/Gui/ViewProviderLink.cpp | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/Gui/ViewProviderLink.cpp b/src/Gui/ViewProviderLink.cpp
index 851c9d8c85..205f3967d9 100644
--- a/src/Gui/ViewProviderLink.cpp
+++ b/src/Gui/ViewProviderLink.cpp
@@ -2874,19 +2874,25 @@ void ViewProviderLink::unsetEditViewer(Gui::View3DInventorViewer* viewer)
     Gui::Control().closeDialog();
 }
 
-Base::Placement ViewProviderLink::currentDraggingPlacement() const{
-    assert(pcDragger);
+Base::Placement ViewProviderLink::currentDraggingPlacement() const
+{
+    // if there isn't an active dragger return a default placement
+    if (!pcDragger)
+        return Base::Placement();
+
     SbVec3f v;
     SbRotation r;
-    if(useCenterballDragger) {
+    if (useCenterballDragger) {
         SoCenterballDragger *dragger = static_cast<SoCenterballDragger*>(pcDragger.get());
         v = dragger->center.getValue();
         r = dragger->rotation.getValue();
-    }else{
+    }
+    else {
         SoFCCSysDragger *dragger = static_cast<SoFCCSysDragger*>(pcDragger.get());
         v = dragger->translation.getValue();
         r = dragger->rotation.getValue();
     }
+
     float q1,q2,q3,q4;
     r.getValue(q1,q2,q3,q4);
     return Base::Placement(Base::Vector3d(v[0],v[1],v[2]),Base::Rotation(q1,q2,q3,q4));