diff --git a/google_chat_ros/scripts/google_chat_ros_node.py b/google_chat_ros/scripts/google_chat_ros_node.py
index a66d1ba7b..43031e417 100644
--- a/google_chat_ros/scripts/google_chat_ros_node.py
+++ b/google_chat_ros/scripts/google_chat_ros_node.py
@@ -222,13 +222,11 @@ def event_cb(self, event, publish_topic=True):
                 action = event.get('action')
                 msg.action.action_method_name = action.get('actionMethodName')
                 if action.get('parameters'):
-                    parameters = []
                     for param in action.get('parameters'):
                         action_parameter = ActionParameter()
-                        action_parameter.key = param.get('key')
-                        action_parameter.value = param.get('value')
-                        parameters.append(action_parameter)
-                msg.action.parameters = parameters
+                        action_parameter.key = param.get("key") if param.get("key") else ""
+                        action_parameter.value = param.get("value") if param.get("value") else ""
+                        msg.action.parameters.append(action_parameter)
             if publish_topic:
                 self._card_activity_pub.publish(msg)
             return msg
diff --git a/google_chat_ros/src/google_chat_ros/google_chat.py b/google_chat_ros/src/google_chat_ros/google_chat.py
index f704bf67d..c95b78a8e 100644
--- a/google_chat_ros/src/google_chat_ros/google_chat.py
+++ b/google_chat_ros/src/google_chat_ros/google_chat.py
@@ -125,7 +125,7 @@ def _pubsub_cb(self, message):
         except Exception as e:
             rospy.logerr("Failed to handle the request from Cloud PubSub.")
             rospy.logerr("It might be caused because of invalid type message from GCP")
-            rospy.logerr("{}".str(e))
+            rospy.logerr(e)
         finally:
             message.ack()