Throw exceptions when qdeling non-datums

code/controllers/subsystem/garbage.dm

@@ -352,12 +352,33 @@ SUBSYSTEM_DEF(garbage)
 /datum/qdel_item/New(mytype)
 	name = "[mytype]"
 
+/proc/non_datum_qdel(to_delete)
+	var/found_type = "unable to determine type"
+	var/delable = FALSE
+
+	if(islist(to_delete))
+		found_type = "list"
+		delable = TRUE
+
+	else if(isnum(to_delete))
+		found_type = "number"
+
+	else if(ispath(to_delete))
+		found_type = "typepath"
+
+	if(delable)
+		del(to_delete)
+
+	CRASH("Bad qdel ([found_type])")
+
 /// Should be treated as a replacement for the 'del' keyword.
 ///
 /// Datums passed to this will be given a chance to clean up references to allow the GC to collect them.
 /proc/qdel(datum/to_delete, force = FALSE)
 	if(!istype(to_delete))
-		del(to_delete)
+		if(isnull(to_delete))
+			return
+		non_datum_qdel(to_delete)
 		return
 
 	var/datum/qdel_item/trash = SSgarbage.items[to_delete.type]

code/game/world.dm

@@ -232,7 +232,7 @@ GLOBAL_VAR(restart_counter)
 	else
 		log_world("Test run failed!\n[fail_reasons.Join("\n")]")
 	sleep(0)	//yes, 0, this'll let Reboot finish and prevent byond memes
-	qdel(src)	//shut it down
+	del(src)	//shut it down
 
 /world/Reboot(reason = 0, fast_track = FALSE)
 	if (reason || fast_track) //special reboot, do none of the normal stuff

code/modules/autowiki/autowiki.dm

@@ -11,7 +11,7 @@
 /proc/generate_autowiki()
 	var/output = generate_autowiki_output()
 	rustg_file_write(output, "data/autowiki_edits.txt")
-	qdel(world)
+	del(world)
 #endif
 
 /// Returns a string of the autowiki output file

code/modules/food_and_drinks/coffee/machine/impressa.dm

@@ -31,7 +31,7 @@
 
 /obj/machinery/coffeemaker/premium/Destroy()
 	QDEL_NULL(coffeepot)
-	QDEL_NULL(coffee)
+	QDEL_LIST(coffee)
 	return ..()
 
 /obj/machinery/coffeemaker/premium/Exited(atom/movable/gone, direction)

code/modules/tgui/tgui_alert.dm

@@ -82,7 +82,7 @@
 
 /datum/tgui_modal/Destroy(force)
 	SStgui.close_uis(src)
-	QDEL_NULL(buttons)
+	buttons = null
 	. = ..()
 
 /**