Closes #2326 for master branch

celery/backends/base.py

@@ -439,18 +439,25 @@ class KeyValueStoreBackend(BaseBackend):
                 return bytes_to_str(key[len(prefix):])
         return bytes_to_str(key)
 
+    def _filter_ready(self, values, READY_STATES=states.READY_STATES):
+        for k, v in values:
+            if v is not None:
+                v = self.decode_result(v)
+                if v['status'] in READY_STATES:
+                    yield k, v
+
     def _mget_to_results(self, values, keys):
         if hasattr(values, 'items'):
             # client returns dict so mapping preserved.
             return {
-                self._strip_prefix(k): self.decode_result(v)
-                for k, v in items(values) if v is not None
+                self._strip_prefix(k): v
+                for k, v in self._filter_ready(items(values))
             }
         else:
             # client returns list so need to recreate mapping.
             return {
-                bytes_to_str(keys[i]): self.decode_result(value)
-                for i, value in enumerate(values) if value is not None
+                bytes_to_str(keys[i]): v
+                for i, v in self._filter_ready(enumerate(values))
             }
 
     def get_many(self, task_ids, timeout=None, interval=0.5, no_ack=True,