diff --git a/cura/Settings/MachineManager.py b/cura/Settings/MachineManager.py
index c5dec6b6cc..2a77032a33 100755
--- a/cura/Settings/MachineManager.py
+++ b/cura/Settings/MachineManager.py
@@ -151,7 +151,7 @@ class MachineManager(QObject):
         if not self._global_container_stack:
             return
 
-        containers = ContainerRegistry.getInstance().findInstanceContainersMetadata(type="variant", definition=self._global_container_stack.getBottom().getId(), name=hotend_id)
+        containers = ContainerRegistry.getInstance().findInstanceContainersMetadata(type = "variant", definition = self._global_container_stack.getBottom().getId(), name = hotend_id)
         if containers:  # New material ID is known
             extruder_manager = ExtruderManager.getInstance()
             machine_id = self.activeMachineId
diff --git a/resources/qml/Preferences/MaterialView.qml b/resources/qml/Preferences/MaterialView.qml
index 143f29c86e..311150c6b9 100644
--- a/resources/qml/Preferences/MaterialView.qml
+++ b/resources/qml/Preferences/MaterialView.qml
@@ -41,7 +41,7 @@ TabView
 
     Tab
     {
-        title: catalog.i18nc("@title","Information")
+        title: catalog.i18nc("@title", "Information")
 
         anchors.margins: UM.Theme.getSize("default_margin").width
 
diff --git a/resources/qml/SidebarHeader.qml b/resources/qml/SidebarHeader.qml
index f3887e2885..551d85ac13 100644
--- a/resources/qml/SidebarHeader.qml
+++ b/resources/qml/SidebarHeader.qml
@@ -252,6 +252,10 @@ Column
             visible: Cura.MachineManager.hasMaterials
             property var valueError:
             {
+                if(Cura.MachineManager.activeMaterialId === "")
+                {
+                    return false
+                }
                 var data = Cura.ContainerManager.getContainerMetaDataEntry(Cura.MachineManager.activeMaterialId, "compatible")
                 if(data == "False")
                 {