diff --git a/system/Config/Services.php b/system/Config/Services.php
index 69b666ff04d4..169795c77a44 100644
--- a/system/Config/Services.php
+++ b/system/Config/Services.php
@@ -75,6 +75,7 @@
 use Config\Toolbar as ToolbarConfig;
 use Config\Validation as ValidationConfig;
 use Config\View as ViewConfig;
+use Locale;
 
 /**
  * Services Configuration file.
@@ -363,8 +364,14 @@ public static function language(?string $locale = null, bool $getShared = true)
             return static::getSharedInstance('language', $locale)->setLocale($locale);
         }
 
+        if (AppServices::request() instanceof IncomingRequest) {
+            $requestLocale = AppServices::request()->getLocale();
+        } else {
+            $requestLocale = Locale::getDefault();
+        }
+
         // Use '?:' for empty string check
-        $locale = $locale ?: AppServices::request()->getLocale();
+        $locale = $locale ?: $requestLocale;
 
         return new Language($locale);
     }
diff --git a/tests/system/CommonFunctionsTest.php b/tests/system/CommonFunctionsTest.php
index c41952fd7554..5c2b6efa7f83 100644
--- a/tests/system/CommonFunctionsTest.php
+++ b/tests/system/CommonFunctionsTest.php
@@ -50,7 +50,7 @@ final class CommonFunctionsTest extends CIUnitTestCase
     protected function setUp(): void
     {
         unset($_ENV['foo'], $_SERVER['foo']);
-        Services::reset();
+        $this->resetServices();
 
         parent::setUp();
     }
@@ -593,8 +593,6 @@ public function testTraceWithCSP()
 
     public function testCspStyleNonce()
     {
-        $this->resetServices();
-
         $config             = config('App');
         $config->CSPEnabled = true;
 
@@ -603,11 +601,20 @@ public function testCspStyleNonce()
 
     public function testCspScriptNonce()
     {
-        $this->resetServices();
-
         $config             = config('App');
         $config->CSPEnabled = true;
 
         $this->assertStringStartsWith('nonce="', csp_script_nonce());
     }
+
+    public function testLangOnCLI()
+    {
+        Services::createRequest(new App(), true);
+
+        $message = lang('CLI.generator.fileCreate', ['TestController.php']);
+
+        $this->assertSame('File created: TestController.php', $message);
+
+        $this->resetServices();
+    }
 }