diff --git a/kilo b/kilo
index 781d50f..4f91242 100755
--- a/kilo
+++ b/kilo
@@ -1,4 +1,4 @@
-#!/usr/bin/php
+#!/usr/bin/env php
 <?php declare(strict_types=1);
 
 namespace Aviat\Kilo;
@@ -6,13 +6,12 @@ namespace Aviat\Kilo;
 require_once __DIR__ . '/vendor/autoload.php';
 
 // Log notices/errors/warnings to file
-set_error_handler(static function (int $no, $str, $file, $line, $context) {
+set_error_handler(static function (int $no, $str, $file, $line) {
 	$msg = print_r([
 		'errno' => $no,
 		'message' => $str,
 		'file' => $file,
 		'line' => $line,
-		// 'context' => $context,
 	], TRUE);
 	file_put_contents('kilo.log', $msg, FILE_APPEND);
 
diff --git a/src/Editor.php b/src/Editor.php
index 2b81c96..c059edf 100644
--- a/src/Editor.php
+++ b/src/Editor.php
@@ -736,7 +736,6 @@ class Editor {
 			$this->refreshScreen();
 
 			$c = $this->readKey();
-			$cord = ord($c);
 
 			if ($c === Key::ESCAPE)
 			{
@@ -837,7 +836,7 @@ class Editor {
 
 		$c = $this->readKey();
 
-		if ($c === "\0")
+		if ($c === "\0" || $c === '')
 		{
 			return '';
 		}
diff --git a/src/Row.php b/src/Row.php
index 2aae6a5..a9988ed 100644
--- a/src/Row.php
+++ b/src/Row.php
@@ -147,6 +147,9 @@ class Row {
 		T_OBJECT_CAST => Highlight::KEYWORD2,
 		T_STRING_CAST => Highlight::KEYWORD2,
 		T_UNSET_CAST => Highlight::KEYWORD2,
+
+		// Invalid syntax
+		T_BAD_CHARACTER => Highlight::INVALID,
 	];
 
 	private array $phpCharacterHighlightMap = [