Index: sources/gui/qml/pages/posttreatment/PostTreatmentBase.qml
===================================================================
diff -u -r1286d74bd015276aab604808be2766136091c125 -rf90366dd7a36ac03a4e387550811fe5b8a7fbe80
--- sources/gui/qml/pages/posttreatment/PostTreatmentBase.qml	(.../PostTreatmentBase.qml)	(revision 1286d74bd015276aab604808be2766136091c125)
+++ sources/gui/qml/pages/posttreatment/PostTreatmentBase.qml	(.../PostTreatmentBase.qml)	(revision f90366dd7a36ac03a4e387550811fe5b8a7fbe80)
@@ -30,17 +30,16 @@
     header.visible  : false
     headerTitle     :  qsTr("End Treatment")
 
-    onVisibleChanged: if (visible) { _root.updateModel() }
+    onVisibleChanged: if ( visible && instructionBased ) { _root.updateModel() }
 
     function updateModel () {
-        let  group = stepNames[stackStepIndex]
-        if ( group === undefined ) group = ""
-        let instructionsGroup    = vSettings.instructions[group]
+        let  group              = stepNames[stackStepIndex] ?? ""
+        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
     }
 }