From 920c90010fdd331187aa15488a5982330f72611a Mon Sep 17 00:00:00 2001
From: Lipu Fei <lipu.fei815@gmail.com>
Date: Thu, 12 Oct 2017 14:54:01 +0200
Subject: [PATCH] Fix base.selectedPrinter is undefined problem

---
 plugins/UM3NetworkPrinting/DiscoverUM3Action.qml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/plugins/UM3NetworkPrinting/DiscoverUM3Action.qml b/plugins/UM3NetworkPrinting/DiscoverUM3Action.qml
index 205dbdc9d9..b20d17a6d4 100644
--- a/plugins/UM3NetworkPrinting/DiscoverUM3Action.qml
+++ b/plugins/UM3NetworkPrinting/DiscoverUM3Action.qml
@@ -278,6 +278,10 @@ Cura.MachineAction
                     width: parent.width
                     wrapMode: Text.WordWrap
                     text:{
+                        if (base.selectedPrinter == undefined)
+                        {
+                            return "";
+                        }
                         // The property cluster size does not exist for older UM3 devices.
                         if(base.selectedPrinter != undefined && base.selectedPrinter.clusterSize == null || base.selectedPrinter.clusterSize == 1)
                         {