fixes vgstation-coders#15870

code/game/machinery/bots/secbot.dm

@@ -724,6 +724,9 @@ Auto Patrol: []"},
 /obj/machinery/bot/secbot/proc/assess_perp(mob/living/carbon/human/perp as mob)
 	var/threatcount = 0 //If threat >= 4 at the end, they get arrested
 
+	if(perp.alpha == 0) //perp is invisible, hence innocent
+		return 0
+
 	if(src.emagged == 2)
 		return PERP_LEVEL_ARREST + rand(PERP_LEVEL_ARREST, PERP_LEVEL_ARREST*5) //Everyone is a criminal!
 
@@ -1223,4 +1226,4 @@ Auto Patrol: []"},
 			S.name = src.created_name
 			W.forceMove(S)
 			S.baton = W
-			qdel(src)
+			qdel(src)