diff --git a/inc/class-phpcs-runner.php b/inc/class-phpcs-runner.php
index 75b528a0..e015ce01 100644
--- a/inc/class-phpcs-runner.php
+++ b/inc/class-phpcs-runner.php
@@ -123,7 +123,7 @@ protected function get_args(): array {
 	 */
 	public function run() {
 		// Backup the original command line arguments.
-		$orig_cmd_args = $_SERVER['argv'];
+		$orig_cmd_args = $_SERVER['argv'] ?? [];
 
 		// Create the default arguments for PHPCS.
 		$defaults = [
@@ -225,4 +225,4 @@ protected function reset_php_codesniffer_config(): void {
 			$overridden_defaults->setAccessible( false );
 		}
 	}
-}
\ No newline at end of file
+}