diff --git a/classes/structure.php b/classes/structure.php
index 6a16719..44c3302 100644
--- a/classes/structure.php
+++ b/classes/structure.php
@@ -440,8 +440,15 @@ class mod_attendance_structure {
             $sess->description = $description;
             $sess->lasttaken = 0;
             $sess->lasttakenby = 0;
-            $sess->studentscanmark = 0;
-            $sess->studentpassword = '';
+            if (!isset($sess->studentscanmark)) {
+                $sess->studentscanmark = 0;
+            }
+            if (!isset($sess->studentpassword)) {
+                $sess->studentpassword = '';
+            }
+            if (!isset($sess->subnet)) {
+                $sess->subnet = '';
+            }
 
             $event->add_record_snapshot('attendance_sessions', $sess);
             $event->trigger();
diff --git a/tests/behat/report.feature b/tests/behat/report.feature
index a1c0866..6a8e220 100644
--- a/tests/behat/report.feature
+++ b/tests/behat/report.feature
@@ -239,4 +239,4 @@ Feature: Visiting reports
          And "5 / 6" "text" should exist in the "Maximum possible points:" "table_row"
          And "83.3%" "text" should exist in the "Maximum possible percentage:" "table_row"
 
-         And I log out
+         And I log out
\ No newline at end of file