diff --git a/mod/scorm/db/mysql.php b/mod/scorm/db/mysql.php
index 1ae99bd0eaf..af60756cf18 100755
--- a/mod/scorm/db/mysql.php
+++ b/mod/scorm/db/mysql.php
@@ -212,6 +212,10 @@ function scorm_upgrade($oldversion) {
         table_column("scorm", "", "maxattempt", "INT", "10", "UNSIGNED", "1", "NOT NULL", "maxgrade"); 
     }
 
+    if ($oldversion < 2006021400) {    //some people have this werid key - see bug 4742
+        execute_sql("ALTER TABLE {$CFG->prefix}scorm_scoes_track DROP INDEX elemeny;",false);  // do it silently
+    }
+
     return true;
 }
 ?>
diff --git a/mod/scorm/version.php b/mod/scorm/version.php
index 66c0c3bca75..1fa6f1489a3 100755
--- a/mod/scorm/version.php
+++ b/mod/scorm/version.php
@@ -5,7 +5,7 @@
 ///  This fragment is called by moodle_needs_upgrading() and /admin/index.php
 /////////////////////////////////////////////////////////////////////////////////
 
-$module->version  = 2005102800;   // The (date) version of this module
+$module->version  = 2006021400;   // The (date) version of this module
 $module->requires = 2005060200;   // The version of Moodle that is required
 $module->cron     = 0;            // How often should cron check this module (seconds)?