diff --git a/lib/adminlib.php b/lib/adminlib.php
index 07f66e4aa9c..125cc64536d 100644
--- a/lib/adminlib.php
+++ b/lib/adminlib.php
@@ -2574,6 +2574,19 @@ class admin_setting_confightmleditor extends admin_setting_configtextarea {
         $editor->use_editor($this->get_id(), array('noclean'=>true));
         return parent::output_html($data, $query);
     }
+
+    /**
+     * Checks if data has empty html.
+     *
+     * @param string $data
+     * @return string Empty when no errors.
+     */
+    public function write_setting($data) {
+        if (trim(html_to_text($data)) === '') {
+            $data = '';
+        }
+        return parent::write_setting($data);
+    }
 }
 
 
diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index f304bab7611..9ad7ffac9d2 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -3378,5 +3378,17 @@ function xmldb_main_upgrade($oldversion) {
     // Automatically generated Moodle v3.7.0 release upgrade line.
     // Put any upgrade step following this.
 
+    if ($oldversion < 2019052001.03) {
+        // Update the empty tag instructions to null.
+        $instructions = get_config('core', 'auth_instructions');
+
+        if (trim(html_to_text($instructions)) === '') {
+            set_config('auth_instructions', '');
+        }
+
+        // Main savepoint reached.
+        upgrade_main_savepoint(true, 2019052001.03);
+    }
+
     return true;
 }
diff --git a/version.php b/version.php
index c815fb01565..d154c09d876 100644
--- a/version.php
+++ b/version.php
@@ -29,7 +29,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$version  = 2019052001.02;              // 20190520      = branching date YYYYMMDD - do not modify!
+$version  = 2019052001.03;              // 20190520      = branching date YYYYMMDD - do not modify!
                                         //         RR    = release increments - 00 in DEV branches.
                                         //           .XX = incremental changes.