From a2bfe1bbe140a03e5ae3d9cb0a368cc10a52f54c Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Wed, 27 Sep 2017 19:12:30 +0200
Subject: [PATCH] check for correct selection in Symmetry and Array sketcher
 commands

---
 src/Mod/Sketcher/Gui/CommandSketcherTools.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp b/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp
index 0fe1c42c63..3b08693b65 100644
--- a/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp
+++ b/src/Mod/Sketcher/Gui/CommandSketcherTools.cpp
@@ -832,6 +832,12 @@ void CmdSketcherSymmetry::activated(int iMsg)
 
     // 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();
@@ -1620,6 +1626,12 @@ void CmdSketcherRectangularArray::activated(int iMsg)
     
     // 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();