No return for them.

code/controllers/failsafe.dm

@@ -17,9 +17,9 @@ var/datum/controller/failsafe/Failsafe
 	if (Failsafe != src)
 		if (istype(Failsafe))
 			qdel(Failsafe)
-			return
 
-	Failsafe = src
+		Failsafe = src
+
 	Failsafe.process()
 
 /datum/controller/failsafe/proc/process()

code/controllers/lighting_controller.dm

@@ -25,9 +25,8 @@ datum/controller/lighting
 		if (istype(lighting_controller)
 			Recover() // If we are replacing an existing lighting_controller (due to a crash) we attempt to preserve as much as we can.
 			qdel(lighting_controller)
-			return
 
-	lighting_controller = src
+		lighting_controller = src
 
 //Workhorse of lighting. It cycles through each light to see which ones need their effects updating. It updates their
 //effects and then processes every turf in the queue, moving the turfs to the corresponing lighting sub-area.

code/controllers/master_controller.dm

@@ -42,15 +42,17 @@ datum/controller/game_controller
 datum/controller/game_controller/New()
 	. = ..()
 
-	//There can be only one master_controller. Out with the old and in with the new.
-	if(master_controller != src)
+	// There can be only one master_controller. Out with the old and in with the new.
+	if (master_controller != src)
 		log_debug("Rebuilding Master Controller")
-		if(istype(master_controller))
+
+		if (istype(master_controller))
 			Recover()
-			del(master_controller)
+			qdel(master_controller)
+
 		master_controller = src
 
-	if(!job_master)
+	if (isnull(job_master))
 		job_master = new /datum/controller/occupations()
 		job_master.SetupOccupations()
 		job_master.LoadJobs("config/jobs.txt")

code/controllers/voting.dm

@@ -17,9 +17,8 @@ datum/controller/vote
 		if (vote != src)
 			if (istype(vote))
 				qdel(vote)
-				return
 
-		vote = src
+			vote = src
 
 	proc/process()	//called by master_controller
 		if(mode)