diff --git a/src/Gui/SelectionFilter.cpp b/src/Gui/SelectionFilter.cpp
index 0679a1588..69a314bf6 100644
--- a/src/Gui/SelectionFilter.cpp
+++ b/src/Gui/SelectionFilter.cpp
@@ -192,6 +192,8 @@ bool SelectionFilter::match(void)
             int subCount=0;
             for (std::vector<Gui::SelectionObject>::const_iterator it2=temp.begin();it2!=temp.end();++it2) {
                 const std::vector<std::string>& subNames = it2->getSubNames();
+                if (subNames.empty())
+                    return false;
                 for (std::vector<std::string>::const_iterator it3=subNames.begin();it3!=subNames.end();++it3) {
                     if (it3->find((*it)->SubName) != 0)
                         return false;
diff --git a/src/Mod/Sketcher/Gui/Command.cpp b/src/Mod/Sketcher/Gui/Command.cpp
index 3965b890d..77feb72f2 100644
--- a/src/Mod/Sketcher/Gui/Command.cpp
+++ b/src/Mod/Sketcher/Gui/Command.cpp
@@ -83,7 +83,14 @@ void CmdSketcherNewSketch::activated(int iMsg)
         Part::Feature *part = static_cast<Part::Feature*>(FaceFilter.Result[0][0].getObject());
         Base::Placement ObjectPos = part->Placement.getValue();
         const std::vector<std::string> &sub = FaceFilter.Result[0][0].getSubNames();
-        if (sub.size() > 1){
+        if (sub.empty()) {
+            // No assert for wrong user input!
+            QMessageBox::warning(Gui::getMainWindow(),
+                qApp->translate(className(),"No sub-elements selected"),
+                qApp->translate(className(),"You have to select a single face as support for a sketch!"));
+            return;
+        }
+        else if (sub.size() > 1) {
             // No assert for wrong user input!
             QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Several sub-elements selected"),
                 QObject::tr("You have to select a single face as support for a sketch!"));