diff --git a/moodle_dl/moodle/mods/lesson.py b/moodle_dl/moodle/mods/lesson.py
index 14c20b2..872eb21 100644
--- a/moodle_dl/moodle/mods/lesson.py
+++ b/moodle_dl/moodle/mods/lesson.py
@@ -99,10 +99,13 @@ async def load_attempt_page(self, attempt_page: Dict) -> List[Dict]:
         page_files = page_result.get('contentfiles', [])
         self.set_props_of_files(page_files, type='lesson_file')
 
+        page_content = page_result.get('pagecontent', '')
+        if page_content is None:
+            page_content= ''
         page_files.append(
             {
                 '_is_page_content': True,
-                'content': page_result.get('pagecontent', '').split('<script>')[0],
+                'content': page_content.split('<script>')[0],
             }
         )
         return page_files
diff --git a/moodle_dl/version.py b/moodle_dl/version.py
index 590ec09..dd52cc8 100644
--- a/moodle_dl/version.py
+++ b/moodle_dl/version.py
@@ -1 +1 @@
-__version__ = '2.3.12'
+__version__ = '2.3.13'