`globals` was getting initialized to null after `switch_event_bind_removable` binding causing `globals.nodes` to get set to NULL causing `switch_event_unbind` not to be able to unbind the SWITCH_EVENT_PRESENCE_PROBE event when unloading the module. Besides not being able to unbind the event, this was also causing a segfault upon receiving a PRESENCE_PROBE event when unloading or reloading the module