diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 5f5caa80fe..908d9f84b1 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -349,7 +349,8 @@ void ObjectList::get_selection_indexes(std::vector<int>& obj_idxs, std::vector<i
 {
     wxDataViewItemArray sels;
     GetSelections(sels);
-    assert(!sels.IsEmpty());
+    if (sels.IsEmpty())
+        return;
 
     if ( m_objects_model->GetItemType(sels[0]) & itVolume || 
         (sels.Count()==1 && m_objects_model->GetItemType(m_objects_model->GetParent(sels[0])) & itVolume) ) {