diff --git a/checks/class-title-check.php b/checks/class-title-check.php
index 2d7bae6..f76b872 100644
--- a/checks/class-title-check.php
+++ b/checks/class-title-check.php
@@ -29,10 +29,12 @@ class Title_Check implements themecheck {
 	 */
 	public function check( $php_files, $css_files, $other_files ) {
 
-		$php = implode( ' ', $php_files );
-
 		foreach ( $php_files as $file_path => $file_content ) {
 
+			if ( ! is_string( $file_content ) || '' === $file_content ) {
+				continue;
+			}
+
 			// Check whether there is a call to wp_title().
 			checkcount();
 			if ( preg_match( '/\bwp_title\b/', $file_content ) ) {
@@ -52,6 +54,10 @@ public function check( $php_files, $css_files, $other_files ) {
 			// Look for anything that looks like <svg>...</svg> and exclude it (inline svg's have titles too).
 			$file_content = preg_replace( '/<svg.*>.*<\/svg>/s', '', $file_content );
 
+			if ( ! is_string( $file_content ) ) {
+				continue;
+			}
+
 			// Look for <title> and </title> tags.
 			checkcount();
 			if ( ( false !== strpos( $file_content, '<title>' ) ) || ( false !== strpos( $file_content, '</title>' ) ) ) {