Fixed integer bug in filename type

Author: Darkmet98

src/References.php

@@ -69,6 +69,11 @@ public function mergeWith(References $references): References
 
         foreach ($references as $filename => $lines) {
             if (empty($lines)) {
+                //Check the $filename type
+                if(gettype($filename) == "integer")
+                    //Set string
+                    $filename = strval($filename);
+
                 $merged->add($filename);
                 continue;
             }