diff --git a/src/GlossTranslator.php b/src/GlossTranslator.php
index cd43f70..d95e1f3 100644
--- a/src/GlossTranslator.php
+++ b/src/GlossTranslator.php
@@ -236,5 +236,7 @@ class GlossTranslator extends Translator
 
             return $line;
         }
+
+        return null;
     }
 }