diff --git a/classes/local/cli/cli_exception.php b/classes/local/cli/cli_exception.php
index 750e98a..6a6e38e 100644
--- a/classes/local/cli/cli_exception.php
+++ b/classes/local/cli/cli_exception.php
@@ -64,6 +64,11 @@ class cli_exception extends Exception {
      */
     const ERROR_OUTAGE_CHANGED = 7;
 
+    /**
+     * The outage plugin is not enabled.
+     */
+    const ERROR_PLUGIN_DISABLED = 8;
+
     /**
      * cliexception constructor.
      * @param string $message An explanation of the exception.
diff --git a/classes/local/cli/clibase.php b/classes/local/cli/clibase.php
index 6d3cae5..064f5a6 100644
--- a/classes/local/cli/clibase.php
+++ b/classes/local/cli/clibase.php
@@ -20,6 +20,7 @@ use coding_exception;
 use core\session\manager;
 
 defined('MOODLE_INTERNAL') || die();
+require_once($CFG->libdir.'/clilib.php');
 
 /**
  * Outage CLI base class.
@@ -47,7 +48,9 @@ abstract class clibase {
      */
     public function __construct(array $options = null) {
         global $CFG;
-        require_once($CFG->libdir.'/clilib.php');
+        if (!is_enabled_auth('outage')) {
+            throw new cli_exception(get_string('cliplugindisabled', 'auth_outage'), cli_exception::ERROR_PLUGIN_DISABLED);
+        }
 
         $this->become_admin_user();
 
diff --git a/cli/create.php b/cli/create.php
index e8123b7..9764321 100644
--- a/cli/create.php
+++ b/cli/create.php
@@ -29,20 +29,19 @@ use auth_outage\local\outagelib;
 
 define('CLI_SCRIPT', true);
 require_once(__DIR__.'/../../../config.php');
-
-$cli = new create();
-
-$config = outagelib::get_config();
-$cli->set_defaults([
-    'help' => false,
-    'warn' => (int)($config->default_warning_duration),
-    'start' => null,
-    'duration' => (int)($config->default_duration),
-    'title' => $config->default_title,
-    'description' => $config->default_description,
-]);
+require_once($CFG->libdir.'/clilib.php');
 
 try {
+    $cli = new create();
+    $config = outagelib::get_config();
+    $cli->set_defaults([
+        'help' => false,
+        'warn' => (int)($config->default_warning_duration),
+        'start' => null,
+        'duration' => (int)($config->default_duration),
+        'title' => $config->default_title,
+        'description' => $config->default_description,
+    ]);
     $cli->execute();
 } catch (cli_exception $e) {
     cli_error($e->getMessage());
diff --git a/cli/finish.php b/cli/finish.php
index a840f57..d3e0fb0 100644
--- a/cli/finish.php
+++ b/cli/finish.php
@@ -28,10 +28,10 @@ use auth_outage\local\cli\finish;
 
 define('CLI_SCRIPT', true);
 require_once(__DIR__.'/../../../config.php');
-
-$cli = new finish();
+require_once($CFG->libdir.'/clilib.php');
 
 try {
+    $cli = new finish();
     $cli->execute();
 } catch (cli_exception $e) {
     cli_error($e->getMessage());
diff --git a/cli/waitforit.php b/cli/waitforit.php
index fb8c0fa..c9859c9 100644
--- a/cli/waitforit.php
+++ b/cli/waitforit.php
@@ -28,10 +28,10 @@ use auth_outage\local\cli\waitforit;
 
 define('CLI_SCRIPT', true);
 require_once(__DIR__.'/../../../config.php');
-
-$cli = new waitforit();
+require_once($CFG->libdir.'/clilib.php');
 
 try {
+    $cli = new waitforit();
     $cli->execute();
 } catch (cli_exception $e) {
     cli_error($e->getMessage());
diff --git a/lang/en/auth_outage.php b/lang/en/auth_outage.php
index 82004de..d57a927 100644
--- a/lang/en/auth_outage.php
+++ b/lang/en/auth_outage.php
@@ -42,6 +42,7 @@ $string['clifinishnotongoing'] = 'Outage is not ongoing.';
 $string['clifinishparamhelp'] = 'shows parameters help.';
 $string['clifinishparamactive'] = 'finishes the currently active outage.';
 $string['clifinishparamoutageid'] = 'the id of the outage to finish.';
+$string['cliplugindisabled'] = 'The authentication plugin \'Outage\' is disabled. Please enable it in the site administration it and try again.';
 $string['cliwaitforiterroridxoractive'] = 'You must use --outageid=# or --active parameter but not both.';
 $string['cliwaitforithelp'] = 'Waits until an outage starts.';
 $string['cliwaitforitoutagestarted'] = 'Outage started!';
diff --git a/tests/phpunit/cli/cli_test.php b/tests/phpunit/cli/cli_test.php
index 400acc5..d26425a 100644
--- a/tests/phpunit/cli/cli_test.php
+++ b/tests/phpunit/cli/cli_test.php
@@ -79,4 +79,17 @@ class cli_test extends cli_testcase {
     public function test_exception() {
         throw new cli_exception('An CLI exception.');
     }
+
+    /**
+     * @expectedException auth_outage\local\cli\cli_exception
+     * @expectedExceptionCode 8
+     */
+    public function test_authdisabled() {
+        // Disable all auth plugins.
+        set_config('auth', '');
+        \core\session\manager::gc(); // Remove stale sessions.
+        core_plugin_manager::reset_caches();
+        // Try to create an CLI
+        $cli = new create();
+    }
 }
diff --git a/tests/phpunit/cli/cli_testcase.php b/tests/phpunit/cli/cli_testcase.php
index 5bf709c..fe2a095 100644
--- a/tests/phpunit/cli/cli_testcase.php
+++ b/tests/phpunit/cli/cli_testcase.php
@@ -28,6 +28,11 @@ defined('MOODLE_INTERNAL') || die();
  */
 class cli_testcase extends advanced_testcase {
     public function setUp() {
+        // Enable auth plugins.
+        set_config('auth', 'outage');
+        \core\session\manager::gc(); // Remove stale sessions.
+        core_plugin_manager::reset_caches();
+
         $this->resetAfterTest(true);
         $this->set_parameters([]);
         parent::setUp();