diff --git a/enrol/database/lib.php b/enrol/database/lib.php
index 50f2571fb53be..818b05ecc26ce 100644
--- a/enrol/database/lib.php
+++ b/enrol/database/lib.php
@@ -74,7 +74,7 @@ public function sync_user_enrolments($user) {
 
         $localrolefield   = $this->get_config('localrolefield');
         $localuserfield   = $this->get_config('localuserfield');
-        $localcoursefiled = $this->get_config('localcoursefield');
+        $localcoursefield = $this->get_config('localcoursefield');
 
         $unenrolaction    = $this->get_config('unenrolaction');
         $defaultrole      = $this->get_config('defaultrole');
@@ -117,7 +117,7 @@ public function sync_user_enrolments($user) {
                         // missing course info
                         continue;
                     }
-                    if (!$course = $DB->get_record('course', array($localcoursefiled=>$fields[$coursefield]), 'id,visible')) {
+                    if (!$course = $DB->get_record('course', array($localcoursefield=>$fields[$coursefield]), 'id,visible')) {
                         continue;
                     }
                     if (!$course->visible and $ignorehidden) {
@@ -265,7 +265,7 @@ public function sync_enrolments() {
 
         $localrolefield   = $this->get_config('localrolefield');
         $localuserfield   = $this->get_config('localuserfield');
-        $localcoursefiled = $this->get_config('localcoursefield');
+        $localcoursefield = $this->get_config('localcoursefield');
 
         $unenrolaction    = $this->get_config('unenrolaction');
         $defaultrole      = $this->get_config('defaultrole');
@@ -308,7 +308,7 @@ public function sync_enrolments() {
 
         // first find all existing courses with enrol instance
         $existing = array();
-        $sql = "SELECT c.id, c.visible, c.$localcoursefiled AS mapping, e.id AS enrolid
+        $sql = "SELECT c.id, c.visible, c.$localcoursefield AS mapping, e.id AS enrolid
                   FROM {course} c
                   JOIN {enrol} e ON (e.courseid = c.id AND e.enrol = 'database')";
         $rs = $DB->get_recordset_sql($sql); // watch out for idnumber duplicates
@@ -321,11 +321,17 @@ public function sync_enrolments() {
         $rs->close();
 
         // add necessary enrol instances that are not present yet
-        $sql = "SELECT c.id, c.visible, c.$localcoursefiled AS mapping
+        $params = array();
+        $localnotempty = "";
+        if ($localcoursefield !== 'id') {
+            $localnotempty =  "AND c.$localcoursefield <> :lcfe";
+            $params['lcfe'] = $DB->sql_empty();
+        }
+        $sql = "SELECT c.id, c.visible, c.$localcoursefield AS mapping
                   FROM {course} c
              LEFT JOIN {enrol} e ON (e.courseid = c.id AND e.enrol = 'database')
-                 WHERE e.id IS NULL AND c.$localcoursefiled <> ?";
-        $rs = $DB->get_recordset_sql($sql, array($DB->sql_empty()));
+                 WHERE e.id IS NULL $localnotempty";
+        $rs = $DB->get_recordset_sql($sql, $params);
         foreach ($rs as $course) {
             if (empty($course->mapping)) {
                 continue;