diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index f5b04bd23a..a905ecdb42 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -216,7 +216,10 @@ class MachineManager(QObject):
 
     @pyqtProperty(int, constant=True)
     def totalNumberOfSettings(self) -> int:
-        return len(CuraContainerRegistry.getInstance().findDefinitionContainers(id = "fdmprinter")[0].getAllKeys())
+        general_definition_containers = CuraContainerRegistry.getInstance().findDefinitionContainers(id = "fdmprinter")
+        if not general_definition_containers:
+            return 0
+        return len(general_definition_containers[0].getAllKeys())
 
     def _onGlobalContainerChanged(self) -> None:
         if self._global_container_stack:
diff --git a/plugins/3MFReader/WorkspaceDialog.py b/plugins/3MFReader/WorkspaceDialog.py
index da682a6fc0..6e1cbb2019 100644
--- a/plugins/3MFReader/WorkspaceDialog.py
+++ b/plugins/3MFReader/WorkspaceDialog.py
@@ -187,7 +187,10 @@ class WorkspaceDialog(QObject):
 
     @pyqtProperty(int, constant = True)
     def totalNumberOfSettings(self):
-        return len(ContainerRegistry.getInstance().findDefinitionContainers(id="fdmprinter")[0].getAllKeys())
+        general_definition_containers = ContainerRegistry.getInstance().findDefinitionContainers(id = "fdmprinter")
+        if not general_definition_containers:
+            return 0
+        return len(general_definition_containers[0].getAllKeys())
 
     @pyqtProperty(int, notify = numVisibleSettingsChanged)
     def numVisibleSettings(self):