diff --git a/plugins/UM3NetworkPrinting/resources/qml/ConfigurationChangeBlock.qml b/plugins/UM3NetworkPrinting/resources/qml/ConfigurationChangeBlock.qml
index 250449a763..63815b58bf 100644
--- a/plugins/UM3NetworkPrinting/resources/qml/ConfigurationChangeBlock.qml
+++ b/plugins/UM3NetworkPrinting/resources/qml/ConfigurationChangeBlock.qml
@@ -136,6 +136,9 @@ Item {
                     elide: Text.ElideRight;
                     font: UM.Theme.getFont("large_nonbold");
                     text: {
+                        if (root.job === null) {
+                            return "";
+                        }
                         if (root.job.configurationChanges.length === 0) {
                             return "";
                         }
@@ -182,11 +185,13 @@ Item {
                     }
                     text: catalog.i18nc("@label", "Override");
                     visible: {
-                        var length = root.job.configurationChanges.length;
-                        for (var i = 0; i < length; i++) {
-                            var typeOfChange = root.job.configurationChanges[i].typeOfChange;
-                            if (typeOfChange === "material_insert" || typeOfChange === "buildplate_change") {
-                                return false;
+                        if (root.job & root.job.configurationChanges) {
+                            var length = root.job.configurationChanges.length;
+                            for (var i = 0; i < length; i++) {
+                                var typeOfChange = root.job.configurationChanges[i].typeOfChange;
+                                if (typeOfChange === "material_insert" || typeOfChange === "buildplate_change") {
+                                    return false;
+                                }
                             }
                         }
                         return true;
@@ -203,6 +208,9 @@ Item {
         onYes: OutputDevice.forceSendJob(root.job.key);
         standardButtons: StandardButton.Yes | StandardButton.No;
         text: {
+            if (!root.job) {
+                return "";
+            }
             var printJobName = formatPrintJobName(root.job.name);
             var confirmText = catalog.i18nc("@label", "Starting a print job with an incompatible configuration could damage your 3D printer. Are you sure you want to override the configuration and print %1?").arg(printJobName);
             return confirmText;
diff --git a/plugins/UM3NetworkPrinting/resources/qml/PrintCoreConfiguration.qml b/plugins/UM3NetworkPrinting/resources/qml/PrintCoreConfiguration.qml
index bede597287..e8abb8109e 100644
--- a/plugins/UM3NetworkPrinting/resources/qml/PrintCoreConfiguration.qml
+++ b/plugins/UM3NetworkPrinting/resources/qml/PrintCoreConfiguration.qml
@@ -73,7 +73,7 @@ Item {
             elide: Text.ElideRight;
             font: UM.Theme.getFont("default");
             text: {
-                if (printCoreConfiguration != undefined && printCoreConfiguration.activeMaterial != undefined) {
+                if (printCoreConfiguration && printCoreConfiguration.activeMaterial != undefined) {
                     return printCoreConfiguration.activeMaterial.name;
                 }
                 return "";
diff --git a/plugins/UM3NetworkPrinting/resources/qml/PrintJobContextMenu.qml b/plugins/UM3NetworkPrinting/resources/qml/PrintJobContextMenu.qml
index 41d28c89f1..7b956a2101 100644
--- a/plugins/UM3NetworkPrinting/resources/qml/PrintJobContextMenu.qml
+++ b/plugins/UM3NetworkPrinting/resources/qml/PrintJobContextMenu.qml
@@ -101,7 +101,14 @@ Item {
             width: parent.width;
 
             PrintJobContextMenuItem {
-                enabled: printJob && !running ? OutputDevice.queuedPrintJobs[0].key != printJob.key : false;
+                enabled: {
+                    if (printJob && !running) {
+                        if (OutputDevice && OutputDevice.queuedPrintJobs[0]) {
+                            return OutputDevice.queuedPrintJobs[0].key != printJob.key;
+                        }
+                    }
+                    return false;
+                }
                 onClicked: {
                     sendToTopConfirmationDialog.visible = true;
                     popup.close();
@@ -169,7 +176,7 @@ Item {
         icon: StandardIcon.Warning;
         onYes: OutputDevice.sendJobToTop(printJob.key);
         standardButtons: StandardButton.Yes | StandardButton.No;
-        text: printJob ? catalog.i18nc("@label %1 is the name of a print job.", "Are you sure you want to move %1 to the top of the queue?").arg(printJob.name) : "";
+        text: printJob && printJob.name ? catalog.i18nc("@label %1 is the name of a print job.", "Are you sure you want to move %1 to the top of the queue?").arg(printJob.name) : "";
         title: catalog.i18nc("@window:title", "Move print job to top");
     }
 
@@ -179,7 +186,7 @@ Item {
         icon: StandardIcon.Warning;
         onYes: OutputDevice.deleteJobFromQueue(printJob.key);
         standardButtons: StandardButton.Yes | StandardButton.No;
-        text: printJob ? catalog.i18nc("@label %1 is the name of a print job.", "Are you sure you want to delete %1?").arg(printJob.name) : "";
+        text: printJob && printJob.name ? catalog.i18nc("@label %1 is the name of a print job.", "Are you sure you want to delete %1?").arg(printJob.name) : "";
         title: catalog.i18nc("@window:title", "Delete print job");
     }
 
@@ -189,7 +196,7 @@ Item {
         icon: StandardIcon.Warning;
         onYes: printJob.setState("abort");
         standardButtons: StandardButton.Yes | StandardButton.No;
-        text: printJob ? catalog.i18nc("@label %1 is the name of a print job.", "Are you sure you want to abort %1?").arg(printJob.name) : "";
+        text: printJob && printJob.name ? catalog.i18nc("@label %1 is the name of a print job.", "Are you sure you want to abort %1?").arg(printJob.name) : "";
         title: catalog.i18nc("@window:title", "Abort print");
     }
 
diff --git a/plugins/UM3NetworkPrinting/resources/qml/PrintJobInfoBlock.qml b/plugins/UM3NetworkPrinting/resources/qml/PrintJobInfoBlock.qml
index 335ee2ba47..fcdf3ba955 100644
--- a/plugins/UM3NetworkPrinting/resources/qml/PrintJobInfoBlock.qml
+++ b/plugins/UM3NetworkPrinting/resources/qml/PrintJobInfoBlock.qml
@@ -78,7 +78,7 @@ Item {
                             anchors.fill: parent;
                             elide: Text.ElideRight;
                             font: UM.Theme.getFont("default_bold");
-                            text: printJob ? printJob.name : ""; // Supress QML warnings
+                            text: printJob && printJob.name ? printJob.name : ""; // Supress QML warnings
                             visible: printJob;
                         }
                     }
@@ -204,7 +204,7 @@ Item {
                             elide: Text.ElideRight;
                             font: UM.Theme.getFont("default_bold");
                             text: {
-                                if (printJob) {
+                                if (printJob !== null) {
                                     if (printJob.assignedPrinter == null) {
                                         if (printJob.state == "error") {
                                             return catalog.i18nc("@label", "Waiting for: Unavailable printer");
@@ -222,7 +222,7 @@ Item {
 
                     PrinterInfoBlock {
                         anchors.bottom: parent.bottom;
-                        printer: root.printJob.assignedPrinter;
+                        printer: root.printJon && root.printJob.assignedPrinter;
                         printJob: root.printJob;
                     }
                 }
@@ -398,11 +398,13 @@ Item {
                             }
                             text: catalog.i18nc("@label", "Override");
                             visible: {
-                                var length = printJob.configurationChanges.length;
-                                for (var i = 0; i < length; i++) {
-                                    var typeOfChange = printJob.configurationChanges[i].typeOfChange;
-                                    if (typeOfChange === "material_insert" || typeOfChange === "buildplate_change") {
-                                        return false;
+                                if (printJob && printJob.configurationChanges) {
+                                    var length = printJob.configurationChanges.length;
+                                    for (var i = 0; i < length; i++) {
+                                        var typeOfChange = printJob.configurationChanges[i].typeOfChange;
+                                        if (typeOfChange === "material_insert" || typeOfChange === "buildplate_change") {
+                                            return false;
+                                        }
                                     }
                                 }
                                 return true;
@@ -418,6 +420,9 @@ Item {
                     onYes: OutputDevice.forceSendJob(printJob.key);
                     standardButtons: StandardButton.Yes | StandardButton.No;
                     text: {
+                        if (!root.job) {
+                            return "";
+                        }
                         var printJobName = formatPrintJobName(printJob.name);
                         var confirmText = catalog.i18nc("@label", "Starting a print job with an incompatible configuration could damage your 3D printer. Are you sure you want to override the configuration and print %1?").arg(printJobName);
                         return confirmText;
diff --git a/plugins/UM3NetworkPrinting/resources/qml/PrintJobTitle.qml b/plugins/UM3NetworkPrinting/resources/qml/PrintJobTitle.qml
index 9dc7dff62e..bfbddb7dce 100644
--- a/plugins/UM3NetworkPrinting/resources/qml/PrintJobTitle.qml
+++ b/plugins/UM3NetworkPrinting/resources/qml/PrintJobTitle.qml
@@ -27,7 +27,7 @@ Column {
             anchors.fill: parent;
             elide: Text.ElideRight;
             font: UM.Theme.getFont("default_bold");
-            text: job ? job.name : "";
+            text: job && job.name ? job.name : "";
             visible: job;
         }
     }
diff --git a/plugins/UM3NetworkPrinting/resources/qml/PrinterCard.qml b/plugins/UM3NetworkPrinting/resources/qml/PrinterCard.qml
index ebfe160e06..1dcf5fd3ad 100644
--- a/plugins/UM3NetworkPrinting/resources/qml/PrinterCard.qml
+++ b/plugins/UM3NetworkPrinting/resources/qml/PrinterCard.qml
@@ -161,12 +161,15 @@ Item {
                             elide: Text.ElideRight;
                             font: UM.Theme.getFont("default");
                             text: {
+                                if (!printer) {
+                                    return "";
+                                }
                                 if (printer.state == "disabled") {
                                     return catalog.i18nc("@label", "Not available");
                                 } else if (printer.state == "unreachable") {
                                     return catalog.i18nc("@label", "Unreachable");
                                 }
-                                if (printer.activePrintJob != null) {
+                                if (printer.activePrintJob != null && printer.activePrintJob.name) {
                                     return printer.activePrintJob.name;
                                 }
                                 return catalog.i18nc("@label", "Available");
diff --git a/plugins/UM3NetworkPrinting/resources/qml/PrinterCardDetails.qml b/plugins/UM3NetworkPrinting/resources/qml/PrinterCardDetails.qml
index 0971776cc6..35a9372713 100644
--- a/plugins/UM3NetworkPrinting/resources/qml/PrinterCardDetails.qml
+++ b/plugins/UM3NetworkPrinting/resources/qml/PrinterCardDetails.qml
@@ -60,7 +60,7 @@ Item {
         
 
         PrintJobPreview {
-            job: root.printer.activePrintJob;
+            job: root.printer && root.printer.activePrintJob ? root.printer.activePrintJob : null;
             anchors.horizontalCenter: parent.horizontalCenter;
         }
     }
diff --git a/plugins/UM3NetworkPrinting/resources/qml/PrinterCardProgressBar.qml b/plugins/UM3NetworkPrinting/resources/qml/PrinterCardProgressBar.qml
index 4fac99f7a2..81ad95bea9 100644
--- a/plugins/UM3NetworkPrinting/resources/qml/PrinterCardProgressBar.qml
+++ b/plugins/UM3NetworkPrinting/resources/qml/PrinterCardProgressBar.qml
@@ -8,7 +8,7 @@ import UM 1.3 as UM
 
 ProgressBar {
     property var progress: {
-        if (printer.activePrintJob == null) {
+        if (!printer || printer.activePrintJob == null) {
             return 0;
         }
         var result = printer.activePrintJob.timeElapsed / printer.activePrintJob.timeTotal;
@@ -25,11 +25,10 @@ ProgressBar {
             /* Sometimes total minus elapsed is less than 0. Use Math.max() to prevent remaining
                 time from ever being less than 0. Negative durations cause strange behavior such
                 as displaying "-1h -1m". */
-            var activeJob = printer.activePrintJob;
-            return Math.max(activeJob.timeTotal - activeJob.timeElapsed, 0);
+            return Math.max(printer.activePrintJob.timeTotal - printer.activePrintJob.timeElapsed, 0);
         }
         property var progressText: {
-            if (printer.activePrintJob == null) {
+            if (!printer.activePrintJob || !printer.activePrintJob.state ) {
                 return "";
             }
             switch (printer.activePrintJob.state) {
@@ -65,6 +64,9 @@ ProgressBar {
         progress: Rectangle {
             id: progressItem;
             color: {
+                if (!printer.activePrintJob) {
+                    return "black";
+                }
                 var state = printer.activePrintJob.state
                 var inactiveStates = [
                     "pausing",
diff --git a/plugins/UM3NetworkPrinting/resources/qml/PrinterInfoBlock.qml b/plugins/UM3NetworkPrinting/resources/qml/PrinterInfoBlock.qml
index b054eb458f..1b20593f9a 100644
--- a/plugins/UM3NetworkPrinting/resources/qml/PrinterInfoBlock.qml
+++ b/plugins/UM3NetworkPrinting/resources/qml/PrinterInfoBlock.qml
@@ -41,7 +41,7 @@ Item {
         }
 
         PrinterFamilyPill {
-            text: printer.type;
+            text: printer ? printer.type : "";
             visible: !compatiblePills.visible && printer;
         }
     }