diff --git a/src/Mod/TechDraw/App/CosmeticEdgePyImp.cpp b/src/Mod/TechDraw/App/CosmeticEdgePyImp.cpp
index ae4e4a0d16..69384d0000 100644
--- a/src/Mod/TechDraw/App/CosmeticEdgePyImp.cpp
+++ b/src/Mod/TechDraw/App/CosmeticEdgePyImp.cpp
@@ -362,6 +362,9 @@ void CosmeticEdgePy::setCenter(Py::Object arg)
     pNew = DrawUtil::invertY(pNew);
     auto oldGeom = getCosmeticEdgePtr()->m_geometry;
     TechDraw::Circle* oldCircle = dynamic_cast<TechDraw::Circle*>(oldGeom);
+    if (oldCircle == nullptr) {
+        throw Py::TypeError("Edge geometry is not a circle");
+    }
 
     getCosmeticEdgePtr()->permaStart = pNew;
     getCosmeticEdgePtr()->permaEnd = pNew;
diff --git a/src/Mod/TechDraw/App/DrawView.cpp b/src/Mod/TechDraw/App/DrawView.cpp
index 40261289a4..48b10ff94f 100644
--- a/src/Mod/TechDraw/App/DrawView.cpp
+++ b/src/Mod/TechDraw/App/DrawView.cpp
@@ -235,11 +235,11 @@ DrawPage* DrawView::findParentPage() const
     std::vector<App::DocumentObject*> parent = getInList();
     for (std::vector<App::DocumentObject*>::iterator it = parent.begin(); it != parent.end(); ++it) {
         if ((*it)->getTypeId().isDerivedFrom(DrawPage::getClassTypeId())) {
-            page = dynamic_cast<TechDraw::DrawPage *>(*it);
+            page = static_cast<TechDraw::DrawPage *>(*it);
         }
 
         if ((*it)->getTypeId().isDerivedFrom(DrawViewCollection::getClassTypeId())) {
-            collection = dynamic_cast<TechDraw::DrawViewCollection *>(*it);
+            collection = static_cast<TechDraw::DrawViewCollection *>(*it);
             page = collection->findParentPage();
         }
 
diff --git a/src/Mod/TechDraw/App/ShapeExtractor.cpp b/src/Mod/TechDraw/App/ShapeExtractor.cpp
index 133d984a80..31792a17bb 100644
--- a/src/Mod/TechDraw/App/ShapeExtractor.cpp
+++ b/src/Mod/TechDraw/App/ShapeExtractor.cpp
@@ -177,7 +177,7 @@ std::vector<TopoDS_Shape> ShapeExtractor::getXShapes(const App::Link* xLink)
 //            }
             Base::Placement childPlm;
             if (l->getTypeId().isDerivedFrom(App::LinkElement::getClassTypeId())) {
-                App::LinkElement* cLinkElem = dynamic_cast<App::LinkElement*>(l);
+                App::LinkElement* cLinkElem = static_cast<App::LinkElement*>(l);
                 if (cLinkElem->hasPlacement()) {
                     childPlm = cLinkElem->getLinkPlacementProperty()->getValue();
                 }
diff --git a/src/Mod/TechDraw/Gui/QGILeaderLine.cpp b/src/Mod/TechDraw/Gui/QGILeaderLine.cpp
index 4a5fe5cfb5..23a516f88b 100644
--- a/src/Mod/TechDraw/Gui/QGILeaderLine.cpp
+++ b/src/Mod/TechDraw/Gui/QGILeaderLine.cpp
@@ -293,6 +293,9 @@ void QGILeaderLine::startPathEdit(void)
 {
     saveState();
     auto featLeader( dynamic_cast<TechDraw::DrawLeaderLine*>(getViewObject()) );
+    if (featLeader == nullptr) {
+        return;
+    }
 
     double scale = featLeader->getScale();
     m_editPath->setScale(scale);
diff --git a/src/Mod/TechDraw/Gui/QGIViewBalloon.cpp b/src/Mod/TechDraw/Gui/QGIViewBalloon.cpp
index e9754da795..a97154326d 100644
--- a/src/Mod/TechDraw/Gui/QGIViewBalloon.cpp
+++ b/src/Mod/TechDraw/Gui/QGIViewBalloon.cpp
@@ -463,6 +463,9 @@ void QGIViewBalloon::balloonLabelDragged(bool ctrl)
 //    Base::Console().Message("QGIVB::bLabelDragged(%d)\n", ctrl);
     m_ctrl = ctrl;
     auto dvb( dynamic_cast<TechDraw::DrawViewBalloon *>(getViewObject()) );
+    if (dvb == nullptr)
+        return;
+
     if (!m_dragInProgress) {           //first drag movement
         m_dragInProgress = true;
         if (ctrl) {             //moving whole thing, remember Origin offset from Bubble
diff --git a/src/Mod/TechDraw/Gui/QGIViewPart.cpp b/src/Mod/TechDraw/Gui/QGIViewPart.cpp
index 926bf4e7fb..26e7535d53 100644
--- a/src/Mod/TechDraw/Gui/QGIViewPart.cpp
+++ b/src/Mod/TechDraw/Gui/QGIViewPart.cpp
@@ -685,7 +685,7 @@ bool QGIViewPart::formatGeomFromCosmetic(std::string cTag, QGIEdge* item)
 //    Base::Console().Message("QGIVP::formatGeomFromCosmetic(%s)\n", cTag.c_str());
     bool result = true;
     auto partFeat( dynamic_cast<TechDraw::DrawViewPart *>(getViewObject()) );
-    TechDraw::CosmeticEdge* ce = partFeat->getCosmeticEdge(cTag);
+    TechDraw::CosmeticEdge* ce = partFeat ? partFeat->getCosmeticEdge(cTag) : nullptr;
     if (ce != nullptr) {
         item->setNormalColor(ce->m_format.m_color.asValue<QColor>());
         item->setWidth(ce->m_format.m_weight * lineScaleFactor);
@@ -701,7 +701,7 @@ bool QGIViewPart::formatGeomFromCenterLine(std::string cTag, QGIEdge* item)
 //    Base::Console().Message("QGIVP::formatGeomFromCenterLine(%d)\n",sourceIndex);
     bool result = true;
     auto partFeat( dynamic_cast<TechDraw::DrawViewPart *>(getViewObject()) );
-    TechDraw::CenterLine* cl = partFeat->getCenterLine(cTag);
+    TechDraw::CenterLine* cl = partFeat ? partFeat->getCenterLine(cTag) : nullptr;
     if (cl != nullptr) {
         item->setNormalColor(cl->m_format.m_color.asValue<QColor>());
         item->setWidth(cl->m_format.m_weight * lineScaleFactor);