Check if file exists

main/admin/configure_homepage.php

@@ -36,9 +36,11 @@ function home_tabs($file_logged_in)
 			$data_logged_in[] = $line;
 		}
 		//tabs file for logged out users
+		if (file_exists($file_logged_out)) {
 			$fp = fopen($file_logged_out, 'w');
 			fputs($fp, implode("\n", $data_logged_out));
 			fclose($fp);
+		}
 		//tabs file for logged in users
 		$fp = fopen($file_logged_in, 'w');
 		fputs($fp, implode("\n", $data_logged_in));