I’ve following neo4j query

match (u:users {id: $id) set u.isOnline = null

It gives update summary for properties set value as 1 for first time and when i re-run the query again it gives 0 for the same value.

But when i run this query

match (u:users {id:$id}) set u.token = $token

It always gives me the update summary for property set value is 1 regardless of how many time i ran this query