diff --git a/src/Gui/ApplicationPy.cpp b/src/Gui/ApplicationPy.cpp
index f948712fda..f3215511e0 100644
--- a/src/Gui/ApplicationPy.cpp
+++ b/src/Gui/ApplicationPy.cpp
@@ -1627,6 +1627,11 @@ PyObject* Application::sCoinRemoveAllChildren(PyObject * /*self*/, PyObject *arg
     PY_TRY {
         void* ptr = nullptr;
         Base::Interpreter().convertSWIGPointerObj("pivy.coin","_p_SoGroup", pynode, &ptr, 0);
+        if (!ptr) {
+            PyErr_SetString(PyExc_RuntimeError, "Conversion of coin.SoGroup failed");
+            return nullptr;
+        }
+
         coinRemoveAllChildren(static_cast<SoGroup*>(ptr));
         Py_Return;
     }
diff --git a/src/Gui/View3DPy.cpp b/src/Gui/View3DPy.cpp
index 4936080ce2..3bd3da248d 100644
--- a/src/Gui/View3DPy.cpp
+++ b/src/Gui/View3DPy.cpp
@@ -1172,6 +1172,9 @@ Py::Object View3DInventorPy::dumpNode(const Py::Tuple& args)
     void* ptr = nullptr;
     try {
         Base::Interpreter().convertSWIGPointerObj("pivy.coin", "SoNode *", object, &ptr, 0);
+        if (!ptr) {
+            throw Py::RuntimeError("Conversion of SoNode failed");
+        }
     }
     catch (const Base::Exception& e) {
         throw Py::RuntimeError(e.what());
@@ -2171,6 +2174,9 @@ Py::Object View3DInventorPy::addEventCallbackPivy(const Py::Tuple& args)
     void* ptr = nullptr;
     try {
         Base::Interpreter().convertSWIGPointerObj("pivy.coin", "SoType *", proxy, &ptr, 0);
+        if (!ptr) {
+            throw Py::RuntimeError("Conversion of SoType failed");
+        }
     }
     catch (const Base::Exception& e) {
         throw Py::RuntimeError(e.what());
@@ -2213,6 +2219,9 @@ Py::Object View3DInventorPy::removeEventCallbackPivy(const Py::Tuple& args)
     void* ptr = nullptr;
     try {
         Base::Interpreter().convertSWIGPointerObj("pivy.coin", "SoType *", proxy, &ptr, 0);
+        if (!ptr) {
+            throw Py::RuntimeError("Conversion of SoType failed");
+        }
     }
     catch (const Base::Exception& e) {
         throw Py::RuntimeError(e.what());
@@ -2303,6 +2312,9 @@ Py::Object View3DInventorPy::addDraggerCallback(const Py::Tuple& args)
     void* ptr = nullptr;
     try {
         Base::Interpreter().convertSWIGPointerObj("pivy.coin", "SoDragger *", dragger, &ptr, 0);
+        if (!ptr) {
+            throw Py::RuntimeError("Conversion of SoDragger failed");
+        }
     }
     catch (const Base::Exception&) {
         throw Py::TypeError("The first argument must be of type SoDragger");
@@ -2355,6 +2367,9 @@ Py::Object View3DInventorPy::removeDraggerCallback(const Py::Tuple& args)
     void* ptr = nullptr;
     try {
         Base::Interpreter().convertSWIGPointerObj("pivy.coin", "SoDragger *", dragger, &ptr, 0);
+        if (!ptr) {
+            throw Py::RuntimeError("Conversion of SoDragger failed");
+        }
     }
     catch (const Base::Exception&) {
         throw Py::TypeError("The first argument must be of type SoDragger");
diff --git a/src/Gui/View3DViewerPy.cpp b/src/Gui/View3DViewerPy.cpp
index 5ae4a4cb74..f8026a1236 100644
--- a/src/Gui/View3DViewerPy.cpp
+++ b/src/Gui/View3DViewerPy.cpp
@@ -220,6 +220,9 @@ Py::Object View3DInventorViewerPy::setSceneGraph(const Py::Tuple& args)
     void* ptr = nullptr;
     try {
         Base::Interpreter().convertSWIGPointerObj("pivy.coin", "SoNode *", proxy, &ptr, 0);
+        if (!ptr) {
+            throw Py::RuntimeError("Conversion of coin.SoNode failed");
+        }
         auto node = static_cast<SoNode*>(ptr);
         _viewer->setSceneGraph(node);
         return Py::None();
@@ -397,6 +400,9 @@ Py::Object View3DInventorViewerPy::setupEditingRoot(const Py::Tuple& args)
         if(pynode!=Py_None) {
             void* ptr = nullptr;
             Base::Interpreter().convertSWIGPointerObj("pivy.coin", "SoNode *", pynode, &ptr, 0);
+            if (!ptr) {
+                throw Py::RuntimeError("Conversion of coin.SoNode failed");
+            }
             node = static_cast<SoNode*>(ptr);
         }
         _viewer->setupEditingRoot(node,mat);
diff --git a/src/Gui/ViewProviderPyImp.cpp b/src/Gui/ViewProviderPyImp.cpp
index 066ae1bd19..0471b7d33d 100644
--- a/src/Gui/ViewProviderPyImp.cpp
+++ b/src/Gui/ViewProviderPyImp.cpp
@@ -319,6 +319,10 @@ PyObject* ViewProviderPy::addDisplayMode(PyObject * args)
     void* ptr = nullptr;
     try {
         Base::Interpreter().convertSWIGPointerObj("pivy.coin","_p_SoNode", obj, &ptr, 0);
+        if (!ptr) {
+            PyErr_SetString(PyExc_RuntimeError, "Conversion of coin.SoNode failed");
+            return nullptr;
+        }
     }
     catch (const Base::Exception& e) {
         PyErr_SetString(PyExc_RuntimeError, e.what());
diff --git a/src/Mod/Part/App/AppPartPy.cpp b/src/Mod/Part/App/AppPartPy.cpp
index b2b7c78b52..98ffcf02f1 100644
--- a/src/Mod/Part/App/AppPartPy.cpp
+++ b/src/Mod/Part/App/AppPartPy.cpp
@@ -2263,6 +2263,9 @@ private:
         try {
             TopoShape* shape = new TopoShape();
             Base::Interpreter().convertSWIGPointerObj("OCC.TopoDS","TopoDS_Shape *", proxy, &ptr, 0);
+            if (!ptr) {
+                throw Py::RuntimeError("Conversion of OCC.TopoDS.TopoDS_Shape failed");
+            }
             TopoDS_Shape* s = static_cast<TopoDS_Shape*>(ptr);
             shape->setShape(*s);
             return Py::asObject(new TopoShapePy(shape));