accident waiting to happen

where i am working at the basement museum there is a gate in the railings that opens out on the pavement.There is a 7 foot drop to the yard below which is nothing to me but it is an awful lot to a 4 year old toddler who managed to open it and nearly fall down it.Thats the last thing i need in my life as the consequences dont bear thinking about.I will have to sort that in the morning as a priority .