diff --git a/share/qtcreator/qmldesigner/contentLibraryQmlSource/ContentLibraryUserView.qml b/share/qtcreator/qmldesigner/contentLibraryQmlSource/ContentLibraryUserView.qml
index 9a8eda0a5e7..eb708a80872 100644
--- a/share/qtcreator/qmldesigner/contentLibraryQmlSource/ContentLibraryUserView.qml
+++ b/share/qtcreator/qmldesigner/contentLibraryQmlSource/ContentLibraryUserView.qml
@@ -96,7 +96,10 @@ Item {
             HelperWidgets.AbstractButton {
                 style: StudioTheme.Values.viewBarButtonStyle
                 buttonIcon: StudioTheme.Constants.add_medium
-                enabled: hasMaterial && hasModelSelection && hasQuick3DImport && hasMaterialLibrary
+                enabled: (this.hasMaterial ?? false)
+                      && hasModelSelection
+                      && hasQuick3DImport
+                      && hasMaterialLibrary
                 tooltip: qsTr("Add a custom bundle folder.")
                 onClicked: ContentLibraryBackend.rootView.browseBundleFolder()
                 x: 5 // left margin
diff --git a/share/qtcreator/qmldesigner/effectComposerQmlSources/BlurHelper.qml b/share/qtcreator/qmldesigner/effectComposerQmlSources/BlurHelper.qml
index da68339603a..80577e932a1 100644
--- a/share/qtcreator/qmldesigner/effectComposerQmlSources/BlurHelper.qml
+++ b/share/qtcreator/qmldesigner/effectComposerQmlSources/BlurHelper.qml
@@ -20,8 +20,8 @@ Item {
         visible: false
         layer.enabled: true
         layer.smooth: true
-        vertexShader: g_propertyData.blur_vs_path
-        fragmentShader: g_propertyData.blur_fs_path
+        vertexShader: g_propertyData?.blur_vs_path ?? ""
+        fragmentShader: g_propertyData?.blur_fs_path ?? ""
     }
 
     QtObject {
diff --git a/share/qtcreator/qmldesigner/effectComposerQmlSources/EffectComposerPreview.qml b/share/qtcreator/qmldesigner/effectComposerQmlSources/EffectComposerPreview.qml
index d8c36e34c22..920d02a304b 100644
--- a/share/qtcreator/qmldesigner/effectComposerQmlSources/EffectComposerPreview.qml
+++ b/share/qtcreator/qmldesigner/effectComposerQmlSources/EffectComposerPreview.qml
@@ -298,8 +298,8 @@ Column {
             BlurHelper {
                 id: blurHelper
                 source: source
-                property int blurMax: g_propertyData.blur_helper_max_level ? g_propertyData.blur_helper_max_level : 64
-                property real blurMultiplier: g_propertyData.blurMultiplier ? g_propertyData.blurMultiplier : 0
+                property int blurMax: g_propertyData?.blur_helper_max_level ?? 64
+                property real blurMultiplier: g_propertyData?.blurMultiplier ?? 0
             }
 
             Item {
diff --git a/share/qtcreator/qmldesigner/newprojectdialog/imports/NewProjectDialog/Styles.qml b/share/qtcreator/qmldesigner/newprojectdialog/imports/NewProjectDialog/Styles.qml
index 6e1467dd2f7..87c9f623536 100644
--- a/share/qtcreator/qmldesigner/newprojectdialog/imports/NewProjectDialog/Styles.qml
+++ b/share/qtcreator/qmldesigner/newprojectdialog/imports/NewProjectDialog/Styles.qml
@@ -132,7 +132,7 @@ Item {
                     delegate: ItemDelegate {
                         id: delegateId
 
-                        readonly property string styleName: model.display
+                        readonly property string styleName: model?.display ?? ""
                         width: stylesList.width
                         height: DialogValues.styleListItemHeight
                         hoverEnabled: true
@@ -180,7 +180,7 @@ Item {
                                         width: DialogValues.styleImageWidth
                                         height: DialogValues.styleImageHeight
                                         asynchronous: false
-                                        source: "image://newprojectdialog_library/" + model.iconName
+                                        source: model?.iconName ? "image://newprojectdialog_library/" + model.iconName : ""
                                     }
                                 } // Rectangle