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-rw-r--r--ryu/ofproto/oxm_fields.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/ryu/ofproto/oxm_fields.py b/ryu/ofproto/oxm_fields.py
index f2f4a7cc..73b55a2a 100644
--- a/ryu/ofproto/oxm_fields.py
+++ b/ryu/ofproto/oxm_fields.py
@@ -227,7 +227,7 @@ def from_jsondict(j):
tlv = j['OXMTlv']
field = tlv['field']
value = tlv['value']
- mask = tlv['mask']
+ mask = tlv.get('mask')
if mask is None:
uv = value
else: