diff --git a/CHANGELOG.md b/CHANGELOG.md
index f8164a88..c317a0cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ CHANGELOG for FlatCAM beta
 
 =================================================
 
+23.11.2021
+
+- added a few protections against RuntimeError exceptions that randomly popup due of wrapped C++ objects being deleted
+
 22.11.2021
 
 - in AppTextEditor made some changes (added some placeholders and a message popup when reaching the end of document)
diff --git a/appObjects/FlatCAMObj.py b/appObjects/FlatCAMObj.py
index 1890c1c1..0e1d44f5 100644
--- a/appObjects/FlatCAMObj.py
+++ b/appObjects/FlatCAMObj.py
@@ -312,7 +312,13 @@ class FlatCAMObj(QtCore.QObject):
         except Exception as e:
             self.app.log.error("FlatCAMObj.build_ui() --> Nothing to remove: %s" % str(e))
 
-        self.app.ui.properties_scroll_area.setWidget(self.ui)
+        try:
+            self.app.ui.properties_scroll_area.setWidget(self.ui)
+        except RuntimeError:
+            try:
+                self.app.ui.properties_scroll_area.setWidget(self.ui)
+            except Exception:
+                pass
         # self.ui.setMinimumWidth(100)
         # self.ui.setMaximumWidth(self.app.ui.properties_tab.sizeHint().width())
 
diff --git a/app_Main.py b/app_Main.py
index d64cd0f3..f28959a6 100644
--- a/app_Main.py
+++ b/app_Main.py
@@ -8443,7 +8443,10 @@ class App(QtCore.QObject):
         if self.ui.notebook.tabText(self.ui.notebook.currentIndex()) == _("Properties"):
             active_obj = self.collection.get_active()
             if active_obj:
-                active_obj.build_ui()
+                try:
+                    active_obj.build_ui()
+                except Exception:
+                    self.setup_default_properties_tab()
             else:
                 self.setup_default_properties_tab()