diff --git a/report/participation/index.php b/report/participation/index.php
index f2b2f70878e..6683087ee89 100644
--- a/report/participation/index.php
+++ b/report/participation/index.php
@@ -86,8 +86,6 @@ echo $OUTPUT->header();
 // Print the selector dropdown.
 $pluginname = get_string('pluginname', 'report_participation');
 report_helper::print_report_selector($pluginname);
-// Release session lock.
-\core\session\manager::write_close();
 
 // Logs will not have been recorded before the course timecreated time.
 $minlog = $course->timecreated;
@@ -185,6 +183,9 @@ if (!empty($instanceid) && !empty($roleid)) {
                                         ));
     $table->setup();
 
+    // Unlock the session only after outputting the table, since the table writes to the session.
+    \core\session\manager::write_close();
+
     // We want to query both the current context and parent contexts.
     list($relatedctxsql, $params) = $DB->get_in_or_equal($context->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'relatedctx');
     $params['roleid'] = $roleid;