diff --git a/book_maker/loader/helper.py b/book_maker/loader/helper.py
index 5f35901..cae8ac8 100644
--- a/book_maker/loader/helper.py
+++ b/book_maker/loader/helper.py
@@ -14,6 +14,7 @@ class EPUBBookLoaderHelper:
     def insert_trans(self, p, text, translation_style="", single_translate=False):
         if (
             p.string is not None
+            and text is not None
             and p.string.replace(" ", "").strip() == text.replace(" ", "").strip()
         ):
             return