diff --git a/composer.json b/composer.json
index 5452a4d..809568d 100644
--- a/composer.json
+++ b/composer.json
@@ -7,12 +7,12 @@
   ],
   "license": "MIT",
   "require-dev": {
+    "php-coveralls/php-coveralls": "2.5.2",
     "phpunit/phpunit": "9.5.21",
-    "squizlabs/php_codesniffer": "3.7.1",
-    "php-coveralls/php-coveralls": "2.5.2"
+    "squizlabs/php_codesniffer": "3.7.1"
   },
   "require": {
-    "phpugph/components": "1.0.5"
+    "phpugph/components": "1.0.6"
   },
   "autoload": {
     "psr-4": {
diff --git a/src/HandlebarsCompiler.php b/src/HandlebarsCompiler.php
index e4e4b16..9ebc9a4 100644
--- a/src/HandlebarsCompiler.php
+++ b/src/HandlebarsCompiler.php
@@ -44,7 +44,7 @@ class HandlebarsCompiler
   /**
    * @const string BLOCK_VARIABLE_VALUE
    */
-  const BLOCK_VARIABLE_VALUE = '\r\t$buffer .= htmlspecialchars($data->find(\'%s\'), ENT_COMPAT, \'UTF-8\');\r';
+  const BLOCK_VARIABLE_VALUE = '\r\t$buffer .= htmlspecialchars($data->find(\'%s\') ?? \'\', ENT_COMPAT, \'UTF-8\');\r';
 
   /**
    * @const string BLOCK_ESCAPE_HELPER_OPEN
@@ -59,7 +59,7 @@ class HandlebarsCompiler
   /**
    * @const string BLOCK_VARIABLE_HELPER_OPEN
    */
-  const BLOCK_VARIABLE_HELPER_OPEN = '\r\t$buffer .= htmlspecialchars($helper[\'%s\'](';
+  const BLOCK_VARIABLE_HELPER_OPEN = '\r\t$buffer .= htmlspecialchars((string) $helper[\'%s\'](';
 
   /**
    * @const string BLOCK_VARIABLE_HELPER_CLOSE
diff --git a/src/HandlebarsHandler.php b/src/HandlebarsHandler.php
index 37fe485..0080592 100644
--- a/src/HandlebarsHandler.php
+++ b/src/HandlebarsHandler.php
@@ -79,13 +79,13 @@ public function compile($template)
 
     $file = $this->cache . '/' . $this->prefix . $name . '.php';
     // @codeCoverageIgnoreStart
-    if (is_dir((string) $this->cache) && file_exists($file)) {
+    if (is_dir($this->cache ?? '') && file_exists($file)) {
       $callback = include($file);
     } else {
       $code = $this->resolve(HandlebarsCompiler::class, $this, $template)
         ->compile();
 
-      if (is_dir((string) $this->cache)) {
+      if (is_dir($this->cache ?? '')) {
         file_put_contents($file, $code);
       }