X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/9ae180ec18f1f397889a4531a12999942edd003a..d2f68bd1e108c3f2dda2322c427050d019b17e04:/sdk/python/arvados/keep.py

diff --git a/sdk/python/arvados/keep.py b/sdk/python/arvados/keep.py
index 842a36d8ed..cca9345bc5 100644
--- a/sdk/python/arvados/keep.py
+++ b/sdk/python/arvados/keep.py
@@ -662,7 +662,7 @@ class KeepClient(object):
     def get_from_cache(self, loc):
         """Fetch a block only if is in the cache, otherwise return None."""
         slot = self.block_cache.get(loc)
-        if slot.ready.is_set():
+        if slot and slot.ready.is_set():
             return slot.get()
         else:
             return None