From ff955c1aa121cd67c20c25cbb1cd1d0283779e90 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sat, 17 Mar 2018 13:50:07 +0100
Subject: [PATCH] check for selected sub-elements in sketcher copy function

---
 src/Mod/Sketcher/Gui/CommandSketcherTools.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp b/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp
index c25fc46809..14fb335cae 100644
--- a/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp
+++ b/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp
@@ -1170,6 +1170,12 @@ void SketcherCopy::activate(bool clone)
 
     // get the needed lists and objects
     const std::vector<std::string> &SubNames = selection[0].getSubNames();
+    if (SubNames.empty()) {
+        QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Wrong selection"),
+                             QObject::tr("Select elements from a single sketch."));
+        return;
+    }
+
     Sketcher::SketchObject* Obj = static_cast<Sketcher::SketchObject*>(selection[0].getObject());
 
     getSelection().clearSelection();