diff -r a8edcb9c1199 -r db03ed8cbfa3 mercurial/context.py
--- a/mercurial/context.py	Fri Dec 12 15:53:17 2014 -0500
+++ b/mercurial/context.py	Mon Dec 15 15:00:54 2014 -0500
@@ -1625,9 +1625,10 @@
 
         # keep this simple for now; just worry about p1
         pctx = self._parents[0]
+        pman = pctx.manifest()
         man = pctx.manifest().copy()
 
-        for f, fnode in man.iteritems():
+        for f, fnode in pman.iteritems():
             p1node = nullid
             p2node = nullid
             p = pctx[f].parents() # if file isn't in pctx, check p2?
@@ -1635,7 +1636,12 @@
                 p1node = p[0].node()
                 if len(p) > 1:
                     p2node = p[1].node()
-            man[f] = revlog.hash(self[f].data(), p1node, p2node)
+            fctx = self[f]
+            if fctx is None:
+                # removed file
+                del man[f]
+            else:
+                man[f] = revlog.hash(fctx.data(), p1node, p2node)
 
         return man