diff --git a/admin/tool/uploadcourse/classes/helper.php b/admin/tool/uploadcourse/classes/helper.php
index 0a3e12e9698..5ffc6779e3f 100644
--- a/admin/tool/uploadcourse/classes/helper.php
+++ b/admin/tool/uploadcourse/classes/helper.php
@@ -164,7 +164,10 @@ class tool_uploadcourse_helper {
         if (!empty($enrolmethods)) {
             $enrolmentplugins = self::get_enrolment_plugins();
             foreach ($enrolmethods as $key => $method) {
-                if (!array_key_exists($method, $enrolmentplugins)) {
+                if (empty($method)) {
+                    // The enrolment method is not specified, we skip it.
+                    continue;
+                } else if (!array_key_exists($method, $enrolmentplugins)) {
                     // Unknown enrolment method.
                     $unknownmethods[] = $method;
                     continue;
diff --git a/admin/tool/uploadcourse/tests/helper_test.php b/admin/tool/uploadcourse/tests/helper_test.php
index 22569e3a000..b10cdaf6c64 100644
--- a/admin/tool/uploadcourse/tests/helper_test.php
+++ b/admin/tool/uploadcourse/tests/helper_test.php
@@ -79,6 +79,7 @@ class tool_uploadcourse_helper_testcase extends advanced_testcase {
             'enrolment_5_test2' => 'test2',
             'enrolment_5_test1' => 'test1',
             'enrolment_5' => 'flatfile',
+            'enrolment_6' => '',
         );
         $expected = array(
             'self' => array(