Merge pull request #11480 from Ghommie/Ghommie-cit623

Banana pies, beams. runtime errors and warnings.

code/datums/beam.dm

@@ -83,6 +83,7 @@
 	elements.Cut()
 
 /datum/beam/Destroy()
+	finished = TRUE
 	Reset()
 	target = null
 	origin = null
@@ -100,7 +101,7 @@
 	var/length = round(sqrt((DX)**2+(DY)**2)) //hypotenuse of the triangle formed by target and origin's displacement
 
 	for(N in 0 to length-1 step 32)//-1 as we want < not <=, but we want the speed of X in Y to Z and step X
-		if(QDELETED(src) || finished)
+		if(finished)
 			break
 		var/obj/effect/ebeam/X = new beam_type(origin_oldloc)
 		X.owner = src