From 272796fd959ac65dc857fb9de8f3542d43166bbc Mon Sep 17 00:00:00 2001
From: fieldOfView <aldo@fieldofview.com>
Date: Thu, 29 Mar 2018 14:46:33 +0200
Subject: [PATCH] Prevent QML warning

---
 resources/qml/SidebarHeader.qml | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/resources/qml/SidebarHeader.qml b/resources/qml/SidebarHeader.qml
index 7590beddc4..1e0a293155 100644
--- a/resources/qml/SidebarHeader.qml
+++ b/resources/qml/SidebarHeader.qml
@@ -17,8 +17,17 @@ Column
     property int currentExtruderIndex: Cura.ExtruderManager.activeExtruderIndex;
     property bool currentExtruderVisible: extrudersList.visible;
     property bool printerConnected: Cura.MachineManager.printerConnected
-    property bool hasManyPrinterTypes: printerConnected ? Cura.MachineManager.printerOutputDevices[0].connectedPrintersTypeCount.length > 1 : false
-
+    property bool hasManyPrinterTypes:
+    {
+        if (printerConnected)
+        {
+            if (Cura.MachineManager.printerOutputDevices[0].connectedPrintersTypeCount != null)
+            {
+                return Cura.MachineManager.printerOutputDevices[0].connectedPrintersTypeCount.length > 1;
+            }
+        }
+        return false;
+    }
     spacing: Math.round(UM.Theme.getSize("sidebar_margin").width * 0.9)
 
     signal showTooltip(Item item, point location, string text)