Index: sources/gui/qml/pages/posttreatment/PostTreatmentBase.qml
===================================================================
diff -u -r7fb13d9e1a453a37ab4dea5536e0f19ed6e272d2 -rd82802819678ccdb5d2cf480cf06071c4b4b4197
--- sources/gui/qml/pages/posttreatment/PostTreatmentBase.qml	(.../PostTreatmentBase.qml)	(revision 7fb13d9e1a453a37ab4dea5536e0f19ed6e272d2)
+++ sources/gui/qml/pages/posttreatment/PostTreatmentBase.qml	(.../PostTreatmentBase.qml)	(revision d82802819678ccdb5d2cf480cf06071c4b4b4197)
@@ -30,18 +30,18 @@
     header.visible  : false
     headerTitle     :  qsTr("End Treatment")
 
-    onVisibleChanged: if (visible) { _root.updateModel() }
+    onVisibleChanged: if ( visible && instructionBased ) { _root.updateModel() }
 
     function updateModel () {
         let stepName = stepNames[stackStepIndex] ?? ""
         let group    = vSettings.groupFormat(stepName, _root.subStepName.length === 0 ? "" : _root.subStepName )
 
         let instructionsGroup    = vSettings.instructions[group]
 
-        if ( instructionsGroup !== undefined ) {
-            instructionTitle      = instructionsGroup.title
-            instructionStepNames  = instructionsGroup.keys
-            instructionStepImages = instructionsGroup.values
-        }
+        if ( ! instructionsGroup ) { return }
+
+        instructionTitle      = instructionsGroup.title
+        instructionStepNames  = instructionsGroup.keys
+        instructionStepImages = instructionsGroup.values
     }
 }