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-rw-r--r--ryu/services/protocols/ovsdb/api.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/ryu/services/protocols/ovsdb/api.py b/ryu/services/protocols/ovsdb/api.py
index c1f04398..9443d750 100644
--- a/ryu/services/protocols/ovsdb/api.py
+++ b/ryu/services/protocols/ovsdb/api.py
@@ -364,6 +364,8 @@ def del_port_by_name(manager, system_id, bridge_name, port_name):
def set_controller(manager, system_id, bridge_name,
target, controller_info=None):
+ controller_info = controller_info or {}
+
def _set_controller(tables, insert):
bridge = _get_bridge(tables, bridge_name)