diff --git a/lib.php b/lib.php
index 027a7cc..3cb17c6 100644
--- a/lib.php
+++ b/lib.php
@@ -412,7 +412,15 @@ class plagiarism_plugin_pchkorg extends plagiarism_plugin {
         $where = new \stdClass();
         $where->cm = $cmid;
         if ($file === null) {
-            $where->signature = sha1($linkarray['content']);
+            if (!array_key_exists('content', $linkarray) && $component == 'qtype_essay' && !empty($linkarray['area'])) {
+                $questions = question_engine::load_questions_usage_by_activity($linkarray['area']);
+                $attempt = $questions->get_question_attempt($linkarray['itemid']);
+                $response = $attempt->get_response_summary();
+                $signature = sha1($response);
+            } else {
+                $signature = sha1($linkarray('content'));
+            }
+            $where->signature = $signature;
             $where->fileid = null;
         } else {
             $where->fileid = $file->get_id();
diff --git a/version.php b/version.php
index b4ef96e..571a849 100644
--- a/version.php
+++ b/version.php
@@ -26,9 +26,9 @@ defined('MOODLE_INTERNAL') || die();
 if (!isset($plugin)) {
     $plugin = new stdClass();
 }
-$plugin->version = 2024072918;
+$plugin->version = 2024100719;
 $plugin->requires = 2020061501; // Requires Moodle 3.9 .
-$plugin->release = 'v3.15.1';
+$plugin->release = 'v3.15.2';
 $plugin->component = 'plagiarism_pchkorg';
 $plugin->maturity = MATURITY_STABLE;
 $plugin->dependencies = array(