diff --git a/spacy/tokens/doc.pyx b/spacy/tokens/doc.pyx
index 2089199a0..ca5a3d696 100644
--- a/spacy/tokens/doc.pyx
+++ b/spacy/tokens/doc.pyx
@@ -431,7 +431,8 @@ cdef class Doc:
         """
         def __get__(self):
             if 'sents' in self.user_hooks:
-                return self.user_hooks['sents'](self)
+                yield from self.user_hooks['sents'](self)
+                return
 
             if not self.is_parsed:
                 raise ValueError(