diff --git a/lang/en_utf8/scorm.php b/lang/en_utf8/scorm.php
index 5e6fdaf58db..19008261eb1 100644
--- a/lang/en_utf8/scorm.php
+++ b/lang/en_utf8/scorm.php
@@ -90,7 +90,7 @@ $string['no_children'] = 'Tag $a->tag must have children';
 $string['noactivity'] = 'Nothing to report';
 $string['nolimit'] = 'Unlimited attempts';
 $string['nomanifest'] = 'Manifest not found';
-$string['noprerequisites'] = 'Sorry but you don\'t reach enough prerequisites to access this learning object';
+$string['noprerequisites'] = 'Sorry but you haven\'t reach enough prerequisites to access this learning object';
 $string['noreports'] = 'No report to display';
 $string['normal'] = 'Normal';
 $string['noscriptnoscorm'] = 'Your browser does not support javascript or it has javascript support disabled. No tracks will recorded.';
diff --git a/mod/scorm/datamodels/scorm_12.js.php b/mod/scorm/datamodels/scorm_12.js.php
index 75b9418a845..6c98d34bf10 100644
--- a/mod/scorm/datamodels/scorm_12.js.php
+++ b/mod/scorm/datamodels/scorm_12.js.php
@@ -377,7 +377,7 @@ function SCORMapi1_2() {
                                     }
                                 } else {
                                     if (element == 'cmi.comments') {
-                                        eval(element+'=value;');
+                                        cmi.comments = cmi.comments + value;
                                     } else {
                                         eval(element+'=value;');
                                     }
@@ -580,7 +580,7 @@ function SCORMapi1_2() {
             if (cmi.core.lesson_mode == 'normal') {
                 if (cmi.core.credit == 'credit') {
                     if (cmi.core.lesson_status == 'completed') {
-                        if (cmi.student_data.mastery_score != '') {
+                        if (cmi.student_data.mastery_score != '' && cmi.core.score.raw != '') {
                             if (parseFloat(cmi.core.score.raw) >= parseFloat(cmi.student_data.mastery_score)) {
                                 cmi.core.lesson_status = 'passed';
                             } else {