Patches some of the most common runtimes

Avoids the runtimes, rather than fixing the underlying problems in most cases

code/datums/emotes.dm

@@ -65,7 +65,7 @@
 		if(!M.client || isnewplayer(M))
 			continue
 		var/T = get_turf(user)
-		if(M.stat == DEAD && M.client && (M.client.prefs.chat_toggles & CHAT_GHOSTSIGHT) && !(M in viewers(T, null)) && (user.client)) //SKYRAT CHANGE - only user controlled mobs show their emotes to all-seeing ghosts, to reduce chat spam
+		if(M.stat == DEAD && M.client && (M.client.prefs && (M.client.prefs.chat_toggles & CHAT_GHOSTSIGHT)) && !(M in viewers(T, null)) && (user.client)) //SKYRAT CHANGE - only user controlled mobs show their emotes to all-seeing ghosts, to reduce chat spam
 			M.show_message(dchatmsg) //SKYRAT CHANGE
 
 	if(emote_type == EMOTE_AUDIBLE)

code/modules/atmospherics/environmental/LINDA_system.dm

@@ -107,6 +107,9 @@
 	if(!isturf(loc) && command)
 		return
 	var/turf/T = get_turf(loc)
+	if(!istype(T))
+		return
+
 	T.air_update_turf(command)
 
 /turf/air_update_turf(command = 0)

code/modules/atmospherics/machinery/components/unary_devices/vent_pump.dm

@@ -92,6 +92,8 @@
 		on = FALSE
 	if(!on || welded)
 		return
+	if (!loc)
+		return
 
 	var/datum/gas_mixture/air_contents = airs[1]
 	var/datum/gas_mixture/environment = loc.return_air()

code/modules/client/client_procs.dm

@@ -422,7 +422,9 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 
 	if(holder)
 		add_admin_verbs()
-		to_chat(src, get_message_output("memo"))
+		var/memos = get_message_output("memo")
+		if (memos)
+			to_chat(src, memos)
 		adminGreet()
 
 	add_verbs_from_config()
@@ -466,7 +468,9 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 
 	if(CONFIG_GET(flag/autoconvert_notes))
 		convert_notes_sql(ckey)
-	to_chat(src, get_message_output("message", ckey))
+	var/ckeyMessage = get_message_output("message", ckey)
+	if (ckeyMessage)
+		to_chat(src, ckeyMessage)
 	if(!winexists(src, "asset_cache_browser")) // The client is using a custom skin, tell them.
 		to_chat(src, "<span class='warning'>Unable to access asset cache browser, if you are using a custom skin file, please allow DS to download the updated version, if you are not, then make a bug report. This is not a critical issue but can cause issues with resource downloading, as it is impossible to know when extra resources arrived to you.</span>")
 

code/modules/mob/living/say.dm

@@ -286,9 +286,9 @@ GLOBAL_LIST_INIT(department_radio_keys, list(
 		if(!M.client || !client) //client is so that ghosts don't have to listen to mice
 			continue
 		if(get_dist(M, source) > 7 || M.z != z) //they're out of range of normal hearing
-			if(eavesdropping_modes[message_mode] && !(M.client.prefs.chat_toggles & CHAT_GHOSTWHISPER)) //they're whispering and we have hearing whispers at any range off
+			if(eavesdropping_modes[message_mode] && !(M.client.prefs && (M.client.prefs.chat_toggles & CHAT_GHOSTWHISPER))) //they're whispering and we have hearing whispers at any range off
 				continue
-			if(!(M.client.prefs.chat_toggles & CHAT_GHOSTEARS)) //they're talking normally and we have hearing at any range off
+			if(!(M.client.prefs && (M.client.prefs.chat_toggles & CHAT_GHOSTEARS))) //they're talking normally and we have hearing at any range off
 				continue
 		listening |= M
 		the_dead[M] = TRUE