diff --git a/pypdf/_writer.py b/pypdf/_writer.py
index cf50ca0bf..7dd684239 100644
--- a/pypdf/_writer.py
+++ b/pypdf/_writer.py
@@ -1671,7 +1671,8 @@ def replace_in_obj(
         # remove orphans (if applicable)
         orphans[self.root_object.indirect_reference.idnum - 1] = False  # type: ignore
 
-        orphans[self._info.indirect_reference.idnum - 1] = False  # type: ignore
+        if self._info is not None:
+            orphans[self._info.indirect_reference.idnum - 1] = False  # type: ignore
 
         try:
             orphans[self._ID.indirect_reference.idnum - 1] = False  # type: ignore