diff --git a/classes/gradeinfo.php b/classes/gradeinfo.php
index d2bb2b9..46c5b31 100644
--- a/classes/gradeinfo.php
+++ b/classes/gradeinfo.php
@@ -339,7 +339,11 @@ class gradeinfo {
         global $DB;
         $grade = $this->gradeitem->get_final($userid);
         // Format grade for proper display
-        $finalgrade = \grade_format_gradevalue($grade->finalgrade,$this->gradeitem,true,null,1);
+        if(is_object($grade)) {
+            $finalgrade = \grade_format_gradevalue($grade->finalgrade,$this->gradeitem,true,null,1);
+        } else {
+            $finalgrade = \grade_format_gradevalue(0,$this->gradeitem,true,null,1);
+        }
 
         // Retrieve the aggregator and determine completion.
         if (!isset($this->studyitem)) {
diff --git a/classes/local/aggregators/bistate_aggregator.php b/classes/local/aggregators/bistate_aggregator.php
index 3102da1..e0c2518 100644
--- a/classes/local/aggregators/bistate_aggregator.php
+++ b/classes/local/aggregators/bistate_aggregator.php
@@ -360,7 +360,7 @@ class bistate_aggregator extends \local_treestudyplan\aggregator {
                 if ($finalgrade >= $gradecfg->min_completed) {
                     // Return completed if completed.
                     return completion::COMPLETED;
-                } else if ($this->use_failed && $coursefinished) {
+                } else if ($this->cfg()->use_failed && $coursefinished) {
                     // Return failed if failed is enabled and the grade is less than the minimum grade for progress.
                     return completion::FAILED;
                 } else {
@@ -371,7 +371,7 @@ class bistate_aggregator extends \local_treestudyplan\aggregator {
                 // If no gradeconfig and gradepass is set, use that one to determine config.
                 if ($finalgrade >= $gradeitem->gradepass) {
                     return completion::COMPLETED;
-                } else if ($this->use_failed && $coursefinished) {
+                } else if ($this->cfg()->use_failed && $coursefinished) {
                     // Return failed if failed is enabled and the grade is 1, while there are at leas 3 states.
                     return completion::FAILED;
                 } else {
diff --git a/classes/studyline.php b/classes/studyline.php
index f2ac8a1..41b1ff6 100644
--- a/classes/studyline.php
+++ b/classes/studyline.php
@@ -275,7 +275,7 @@ class studyline {
      */
     public function enrol_roles_model() : array {
         $list = [];
-        foreach($this->enrol_roles as $role) {
+        foreach($this->enrol_roles() as $role) {
             $name = role_get_name($role,$this->context()); // Get localized role name.
             $list[] = [
                 "id" => $role->id,
diff --git a/classes/studyplan.php b/classes/studyplan.php
index d004b61..24101e7 100644
--- a/classes/studyplan.php
+++ b/classes/studyplan.php
@@ -47,7 +47,7 @@ class studyplan {
     /**
      * Cache retrieved pages for the studyplan in this session
      * @var array */
-    private static $pagecache = [];
+    private $pagecache = [];
 
     /**
      * Holds database record
diff --git a/classes/studyplanpage.php b/classes/studyplanpage.php
index 4c12a3d..f76eb74 100644
--- a/classes/studyplanpage.php
+++ b/classes/studyplanpage.php
@@ -166,8 +166,8 @@ class studyplanpage {
 
     public function timing() {
         $now = new \DateTime();
-        if ($now > $this->startdate) {
-            if ($this->enddate > 0 && $now > $this->enddate) {
+        if ($now > $this->startdate()) {
+            if ($now > $this->enddate()) {
                 return "past";
             } else {
                 return "present";
diff --git a/lang/en/local_treestudyplan.php b/lang/en/local_treestudyplan.php
index 1a8af1c..b114710 100644
--- a/lang/en/local_treestudyplan.php
+++ b/lang/en/local_treestudyplan.php
@@ -305,7 +305,7 @@ $string["nogrades"] = 'No grades';
 $string["unknown"] = 'Grading status unknown';
 $string["when"] = "when";
 
-$string["selectstudent_btn"] = "View student plans";
+$string["selectstudent_btn"] = "Select view";
 $string["selectstudent"] = "Choose student";
 $string["selectstudent_details"] = "Pick a student from the list below to see their progress in this study plan";
 $string["showoverview"] = "Teacher view";
diff --git a/lang/nl/local_treestudyplan.php b/lang/nl/local_treestudyplan.php
index ebb7b11..1d8f6bd 100644
--- a/lang/nl/local_treestudyplan.php
+++ b/lang/nl/local_treestudyplan.php
@@ -306,7 +306,7 @@ $string["nogrades"] = 'Geen items';
 $string["unknown"] = 'Beoordelingen onbekend';
 $string["when"] = "zodra";
 
-$string["selectstudent_btn"] = "Bekijk studentenvoortgang";
+$string["selectstudent_btn"] = "Selecteer overzicht";
 $string["selectstudent"] = "Kies een student";
 $string["selectstudent_details"] = "Kies een student uit de lijst om zijn/haar voortgang in dit studieplan te bekijken";
 $string["showoverview"] = "Docentenweergave";
diff --git a/myreport.php b/myreport.php
index 764e5e9..bc50016 100644
--- a/myreport.php
+++ b/myreport.php
@@ -24,7 +24,6 @@ require_once("../../config.php");
 
 require_once($CFG->libdir.'/weblib.php');
 
-use local_treestudyplan;
 use local_treestudyplan\studyplan;
 use local_treestudyplan\teachingfinder;
 
diff --git a/version.php b/version.php
index 8009922..e84b189 100644
--- a/version.php
+++ b/version.php
@@ -22,7 +22,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = 'local_treestudyplan';  // Recommended since 2.0.2 (MDL-26035). Required since 3.0 (MDL-48494).
-$plugin->version = 2024052400;  // YYYYMMDDHH (year, month, day, iteration).
+$plugin->version = 2024053103;  // YYYYMMDDHH (year, month, day, iteration).
 $plugin->requires = 2021051700; // YYYYMMDDHH (This is the release version for Moodle 3.11).
 
 $plugin->release = "1.3.0";