diff --git a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
index a3f2d71701..6fb9eed083 100644
--- a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
+++ b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
@@ -3385,6 +3385,7 @@ void ViewProviderSketch::unsetEdit(int ModNum)
 void ViewProviderSketch::setEditViewer(Gui::View3DInventorViewer* viewer, int ModNum)
 {
     Q_UNUSED(ModNum);
+    Base::PyGILStateLocker lock;
     // visibility automation: save camera
     if (!this->TempoVis.getValue().isNone()) {
         try {