diff --git a/main/inc/lib/exercise.lib.php b/main/inc/lib/exercise.lib.php
index a739dde55f..dd1977da6c 100644
--- a/main/inc/lib/exercise.lib.php
+++ b/main/inc/lib/exercise.lib.php
@@ -622,12 +622,12 @@ class ExerciseLib
                      * the text to find mustn't contains HTML tags
                      * the text to find mustn't contains char "
                      */
-                    global $exerciseId;
+                    global $exe_id;
                     $trackAttempts = Database::get_main_table(
                         TABLE_STATISTIC_TRACK_E_ATTEMPT
                     );
                     $sql = 'SELECT answer FROM ' . $trackAttempts . '
-                            WHERE exe_id=' . $exerciseId . ' AND question_id=' . $questionId;
+                            WHERE exe_id=' . $exe_id . ' AND question_id=' . $questionId;
                     $rsLastAttempt = Database::query($sql);
                     $rowLastAttempt = Database::fetch_array($rsLastAttempt);
                     $answer = $rowLastAttempt['answer'];