diff --git a/src/Mod/Part/Gui/TaskLoft.cpp b/src/Mod/Part/Gui/TaskLoft.cpp
index 9fd33b247..6f4b5371e 100644
--- a/src/Mod/Part/Gui/TaskLoft.cpp
+++ b/src/Mod/Part/Gui/TaskLoft.cpp
@@ -133,7 +133,7 @@ bool LoftWidget::accept()
 
     int count = d->ui.selector->selectedTreeWidget()->topLevelItemCount();
     if (count < 2) {
-        QMessageBox::critical(this, tr("Too few elements"), tr("At least two vertices, edges, wires or Faces are required."));
+        QMessageBox::critical(this, tr("Too few elements"), tr("At least two vertices, edges, wires or faces are required."));
         return false;
     }
     for (int i=0; i<count; i++) {
@@ -155,11 +155,17 @@ bool LoftWidget::accept()
         if (!doc) throw Base::Exception("Document doesn't exist anymore");
         doc->openCommand("Loft");
         Gui::Application::Instance->runPythonCode((const char*)cmd.toAscii(), false, false);
-        doc->commitCommand();
         doc->getDocument()->recompute();
+        App::DocumentObject* obj = doc->getDocument()->getActiveObject();
+        if (obj && !obj->isValid()) {
+            std::string msg = obj->getStatusString();
+            doc->abortCommand();
+            throw Base::Exception(msg);
+        }
+        doc->commitCommand();
     }
     catch (const Base::Exception& e) {
-        Base::Console().Error("%s\n", e.what());
+        QMessageBox::warning(this, tr("Input error"), QString::fromAscii(e.what()));
         return false;
     }
 
diff --git a/src/Mod/Part/Gui/TaskSweep.cpp b/src/Mod/Part/Gui/TaskSweep.cpp
index 9d0141ef3..fb1c899ab 100644
--- a/src/Mod/Part/Gui/TaskSweep.cpp
+++ b/src/Mod/Part/Gui/TaskSweep.cpp
@@ -182,11 +182,17 @@ bool SweepWidget::accept()
         if (!doc) throw Base::Exception("Document doesn't exist anymore");
         doc->openCommand("Sweep");
         Gui::Application::Instance->runPythonCode((const char*)cmd.toAscii(), false, false);
-        doc->commitCommand();
         doc->getDocument()->recompute();
+        App::DocumentObject* obj = doc->getDocument()->getActiveObject();
+        if (obj && !obj->isValid()) {
+            std::string msg = obj->getStatusString();
+            doc->abortCommand();
+            throw Base::Exception(msg);
+        }
+        doc->commitCommand();
     }
     catch (const Base::Exception& e) {
-        Base::Console().Error("%s\n", e.what());
+        QMessageBox::warning(this, tr("Input error"), QString::fromAscii(e.what()));
         return false;
     }