For some reason this breaks the mob controller

code/controllers/ProcessScheduler/core/process.dm

@@ -398,3 +398,11 @@
 	if(isnull(caught) || !istype(caught) || !isnull(caught.gcDestroyed))
 		return // Only bother with types we can identify and that don't belong
 	catchException("Type [caught.type] does not belong in process' queue")
+
+// This is called to make a controller THE global authority on a global variable - like `air_master`
+/datum/controller/process/proc/assertGlobality()
+	return
+
+// Called to let another instance of the controller have the fun
+/datum/controller/process/proc/releaseGlobality()
+	return

code/controllers/ProcessScheduler/core/processScheduler.dm

@@ -122,6 +122,7 @@ var/global/datum/controller/processScheduler/processScheduler
 	process.idle()
 	idle.Add(process)
 
+	process.assertGlobality()
 	// Set up process
 	process.setup()
 
@@ -132,6 +133,8 @@ var/global/datum/controller/processScheduler/processScheduler
 	processes.Remove(oldProcess)
 	processes.Add(newProcess)
 
+	oldProcess.releaseGlobality()
+	newProcess.assertGlobality()
 	newProcess.idle()
 	idle.Remove(oldProcess)
 	running.Remove(oldProcess)