From 17c467e0ab143eb89c45917740b5d32be303f56a Mon Sep 17 00:00:00 2001
From: Matthew Honnibal <honnibal+gh@gmail.com>
Date: Wed, 11 Oct 2017 03:33:06 -0500
Subject: [PATCH] Avoid clobbering existing lemmas

---
 spacy/morphology.pyx | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/spacy/morphology.pyx b/spacy/morphology.pyx
index 5a4399698..b8dbb83ba 100644
--- a/spacy/morphology.pyx
+++ b/spacy/morphology.pyx
@@ -55,7 +55,7 @@ cdef class Morphology:
         # Add a 'null' tag, which we can reference when assign morphology to
         # untagged tokens.
         self.rich_tags[self.n_tags].id = self.n_tags
- 
+
         self._cache = PreshMapArray(self.n_tags)
         self.exc = {}
         if exc is not None:
@@ -68,7 +68,8 @@ cdef class Morphology:
 
     cdef int assign_untagged(self, TokenC* token) except -1:
         '''Set morphological attributes on a token without a POS tag.'''
-        token.lemma = self.lemmatize(0, token.lex.orth, {})
+        if token.lemma == 0:
+            token.lemma = self.lemmatize(0, token.lex.orth, {})
 
     cdef int assign_tag(self, TokenC* token, tag) except -1:
         if isinstance(tag, basestring):