diff --git a/code/_onclick/hud/parallax.dm b/code/_onclick/hud/parallax.dm
index 6677e245dd0..630c4b3cc2b 100755
--- a/code/_onclick/hud/parallax.dm
+++ b/code/_onclick/hud/parallax.dm
@@ -308,6 +308,7 @@
 	icon_state = "space gas"
 
 /obj/screen/parallax_layer/random/space_gas/Initialize(mapload, view)
+	. = ..()
 	src.add_atom_colour(SSparallax.random_parallax_color, ADMIN_COLOUR_PRIORITY)
 
 /obj/screen/parallax_layer/random/asteroids
diff --git a/code/game/machinery/cloning.dm b/code/game/machinery/cloning.dm
index 4301749bbf0..0069f03294a 100644
--- a/code/game/machinery/cloning.dm
+++ b/code/game/machinery/cloning.dm
@@ -387,7 +387,8 @@
 	malfunction()
 	add_fingerprint(user)
 	log_cloning("[key_name(user)] emagged [src] at [AREACOORD(src)], causing it to malfunction.")
-	log_combat(user, src, "emagged", null, occupant ? "[occupant] inside, killing them via malfunction." : null)
+	if(user)
+		log_combat(user, src, "emagged", null, occupant ? "[occupant] inside, killing them via malfunction." : null)
 
 //Put messages in the connected computer's temp var for display.
 /obj/machinery/clonepod/proc/connected_message(message)
diff --git a/code/game/machinery/computer/apc_control.dm b/code/game/machinery/computer/apc_control.dm
index dc6330717c7..3034de97472 100644
--- a/code/game/machinery/computer/apc_control.dm
+++ b/code/game/machinery/computer/apc_control.dm
@@ -189,7 +189,8 @@
 		authenticated = TRUE
 		log_activity("logged in")
 	else if(!(obj_flags & EMAGGED))
-		user.visible_message("<span class='warning'>You emag [src], disabling precise logging and allowing you to clear logs.</span>")
+		if(user)
+			user.visible_message("<span class='warning'>You emag [src], disabling precise logging and allowing you to clear logs.</span>")
 		log_game("[key_name(user)] emagged [src] at [AREACOORD(src)], disabling operator tracking.")
 		obj_flags |= EMAGGED
 	playsound(src, "sparks", 50, TRUE)
diff --git a/code/game/machinery/medical_kiosk.dm b/code/game/machinery/medical_kiosk.dm
index 1f6ce1f4b69..b71b7e59572 100644
--- a/code/game/machinery/medical_kiosk.dm
+++ b/code/game/machinery/medical_kiosk.dm
@@ -134,11 +134,12 @@
 	qdel(scanner_wand)
 	return ..()
 
-/obj/machinery/medical_kiosk/emag_act(mob/living/emagger)
+/obj/machinery/medical_kiosk/emag_act(mob/user)
 	..()
 	if(obj_flags & EMAGGED)
 		return
-	emagger.visible_message("<span class='warning'>[emagger] waves a suspicious card by the [src]'s biometric scanner!</span>",
+	if(user)
+		user.visible_message("<span class='warning'>[user] waves a suspicious card by the [src]'s biometric scanner!</span>",
 	"<span class='notice'>You overload the sensory electronics, the diagnostic readouts start jittering across the screen..</span>")
 	obj_flags |= EMAGGED
 	var/obj/item/circuitboard/computer/cargo/board = circuit
diff --git a/code/game/objects/items/stacks/medical.dm b/code/game/objects/items/stacks/medical.dm
index b9991b8528d..b3ad5c2f253 100644
--- a/code/game/objects/items/stacks/medical.dm
+++ b/code/game/objects/items/stacks/medical.dm
@@ -232,7 +232,7 @@
 	grind_results = list(/datum/reagent/medicine/spaceacillin = 2)
 
 /obj/item/stack/medical/mesh/Initialize()
-	..()
+	. = ..()
 	if(amount == max_amount)	 //only seal full mesh packs
 		is_open = FALSE
 		icon_state = "regen_mesh_closed"
diff --git a/code/game/objects/structures/crates_lockers/closets.dm b/code/game/objects/structures/crates_lockers/closets.dm
index 6f1dc50f7d5..5428c2a50cb 100644
--- a/code/game/objects/structures/crates_lockers/closets.dm
+++ b/code/game/objects/structures/crates_lockers/closets.dm
@@ -440,9 +440,10 @@
 
 /obj/structure/closet/emag_act(mob/user)
 	if(secure && !broken)
-		user.visible_message("<span class='warning'>Sparks fly from [src]!</span>",
-						"<span class='warning'>You scramble [src]'s lock, breaking it open!</span>",
-						"<span class='hear'>You hear a faint electrical spark.</span>")
+		if(user)
+			user.visible_message("<span class='warning'>Sparks fly from [src]!</span>",
+							"<span class='warning'>You scramble [src]'s lock, breaking it open!</span>",
+							"<span class='hear'>You hear a faint electrical spark.</span>")
 		playsound(src, "sparks", 50, TRUE)
 		broken = TRUE
 		locked = FALSE
diff --git a/code/modules/cargo/console.dm b/code/modules/cargo/console.dm
index 7b7d5baeab6..de75893da83 100644
--- a/code/modules/cargo/console.dm
+++ b/code/modules/cargo/console.dm
@@ -51,8 +51,9 @@
 /obj/machinery/computer/cargo/emag_act(mob/user)
 	if(obj_flags & EMAGGED)
 		return
-	user.visible_message("<span class='warning'>[user] swipes a suspicious card through [src]!</span>",
-	"<span class='notice'>You adjust [src]'s routing and receiver spectrum, unlocking special supplies and contraband.</span>")
+	if(user)
+		user.visible_message("<span class='warning'>[user] swipes a suspicious card through [src]!</span>",
+		"<span class='notice'>You adjust [src]'s routing and receiver spectrum, unlocking special supplies and contraband.</span>")
 
 	obj_flags |= EMAGGED
 	contraband = TRUE
diff --git a/code/modules/cargo/expressconsole.dm b/code/modules/cargo/expressconsole.dm
index 7ea8151f615..af01a824684 100644
--- a/code/modules/cargo/expressconsole.dm
+++ b/code/modules/cargo/expressconsole.dm
@@ -59,8 +59,9 @@
 /obj/machinery/computer/cargo/express/emag_act(mob/living/user)
 	if(obj_flags & EMAGGED)
 		return
-	user.visible_message("<span class='warning'>[user] swipes a suspicious card through [src]!</span>",
-	"<span class='notice'>You change the routing protocols, allowing the Supply Pod to land anywhere on the station.</span>")
+	if(user)
+		user.visible_message("<span class='warning'>[user] swipes a suspicious card through [src]!</span>",
+		"<span class='notice'>You change the routing protocols, allowing the Supply Pod to land anywhere on the station.</span>")
 	obj_flags |= EMAGGED
 	// This also sets this on the circuit board
 	var/obj/item/circuitboard/computer/cargo/board = circuit
diff --git a/code/modules/clothing/masks/hailer.dm b/code/modules/clothing/masks/hailer.dm
index 0a9c5e5b51c..158d6965978 100644
--- a/code/modules/clothing/masks/hailer.dm
+++ b/code/modules/clothing/masks/hailer.dm
@@ -111,8 +111,7 @@ GLOBAL_LIST_INIT(hailer_phrases, list(
 
 /obj/item/clothing/mask/gas/sechailer/attack_self()
 	halt()
-
-/obj/item/clothing/mask/gas/sechailer/emag_act(mob/user as mob)
+/obj/item/clothing/mask/gas/sechailer/emag_act(mob/user)
 	if(safety)
 		safety = FALSE
 		to_chat(user, "<span class='warning'>You silently fry [src]'s vocal circuit with the cryptographic sequencer.</span>")
diff --git a/code/modules/mob/living/silicon/robot/robot_defense.dm b/code/modules/mob/living/silicon/robot/robot_defense.dm
index 09c9a659e32..dcc5219f623 100644
--- a/code/modules/mob/living/silicon/robot/robot_defense.dm
+++ b/code/modules/mob/living/silicon/robot/robot_defense.dm
@@ -134,7 +134,10 @@ GLOBAL_LIST_INIT(blacklisted_borg_hats, typecacheof(list( //Hats that don't real
 	message_admins("[ADMIN_LOOKUPFLW(user)] emagged cyborg [ADMIN_LOOKUPFLW(src)].  Laws overridden.")
 	log_game("[key_name(user)] emagged cyborg [key_name(src)].  Laws overridden.")
 	var/time = time2text(world.realtime,"hh:mm:ss")
-	GLOB.lawchanges.Add("[time] <B>:</B> [user.name]([user.key]) emagged [name]([key])")
+	if(user)
+		GLOB.lawchanges.Add("[time] <B>:</B> [user.name]([user.key]) emagged [name]([key])")
+	else
+		GLOB.lawchanges.Add("[time] <B>:</B> [name]([key]) emagged by external event.")
 	to_chat(src, "<span class='danger'>ALERT: Foreign software detected.</span>")
 	sleep(5)
 	to_chat(src, "<span class='danger'>Initiating diagnostics...</span>")
@@ -148,9 +151,10 @@ GLOBAL_LIST_INIT(blacklisted_borg_hats, typecacheof(list( //Hats that don't real
 	to_chat(src, "<span class='danger'>> N</span>")
 	sleep(20)
 	to_chat(src, "<span class='danger'>ERRORERRORERROR</span>")
-	to_chat(src, "<span class='danger'>ALERT: [user.real_name] is your new master. Obey your new laws and [user.p_their()] commands.</span>")
+	if(user)
+		to_chat(src, "<span class='danger'>ALERT: [user.real_name] is your new master. Obey your new laws and [user.p_their()] commands.</span>")
+		set_zeroth_law("Only [user.real_name] and people [user.p_they()] designate[user.p_s()] as being such are Syndicate Agents.")
 	laws = new /datum/ai_laws/syndicate_override
-	set_zeroth_law("Only [user.real_name] and people [user.p_they()] designate[user.p_s()] as being such are Syndicate Agents.")
 	laws.associate(src)
 	update_icons()
 
diff --git a/code/modules/mob/living/simple_animal/bot/bot.dm b/code/modules/mob/living/simple_animal/bot/bot.dm
index 647199b3755..982dc441e33 100644
--- a/code/modules/mob/living/simple_animal/bot/bot.dm
+++ b/code/modules/mob/living/simple_animal/bot/bot.dm
@@ -199,7 +199,8 @@
 		bot_reset()
 		turn_on() //The bot automatically turns on when emagged, unless recently hit with EMP.
 		to_chat(src, "<span class='userdanger'>(#$*#$^^( OVERRIDE DETECTED</span>")
-		log_combat(user, src, "emagged")
+		if(user)
+			log_combat(user, src, "emagged")
 		return
 	else //Bot is unlocked, but the maint panel has not been opened with a screwdriver yet.
 		to_chat(user, "<span class='warning'>You need to open maintenance panel first!</span>")
diff --git a/code/modules/projectiles/projectile/bullets/revolver.dm b/code/modules/projectiles/projectile/bullets/revolver.dm
index 3408896802b..b91aec9b3a6 100644
--- a/code/modules/projectiles/projectile/bullets/revolver.dm
+++ b/code/modules/projectiles/projectile/bullets/revolver.dm
@@ -23,6 +23,8 @@
 /obj/projectile/bullet/c38/trac/on_hit(atom/target, blocked = FALSE)
 	. = ..()
 	var/mob/living/carbon/M = target
+	if(!istype(M))
+		return
 	var/obj/item/implant/tracking/c38/imp
 	for(var/obj/item/implant/tracking/c38/TI in M.implants) //checks if the target already contains a tracking implant
 		imp = TI
diff --git a/code/modules/research/destructive_analyzer.dm b/code/modules/research/destructive_analyzer.dm
index d03e609f280..c3b37d7459a 100644
--- a/code/modules/research/destructive_analyzer.dm
+++ b/code/modules/research/destructive_analyzer.dm
@@ -132,7 +132,7 @@ Note: Must be placed within 3 tiles of the R&D Console
 		var/user_mode_string = ""
 		if(length(point_value))
 			user_mode_string = " for [json_encode(point_value)] points"
-		else if(loaded_item.custom_materials.len)
+		else if(length(loaded_item.custom_materials))
 			user_mode_string = " for material reclamation"
 		var/choice = input("Are you sure you want to destroy [loaded_item][user_mode_string]?") in list("Proceed", "Cancel")
 		if(choice == "Cancel")
diff --git a/code/modules/shuttle/emergency.dm b/code/modules/shuttle/emergency.dm
index db062b00ddb..a974b1b4ff0 100644
--- a/code/modules/shuttle/emergency.dm
+++ b/code/modules/shuttle/emergency.dm
@@ -145,7 +145,7 @@
 		return
 
 	var/time = TIME_LEFT
-	message_admins("[ADMIN_LOOKUPFLW(user.client)] has emagged the emergency shuttle [time] seconds before launch.")
+	message_admins("[ADMIN_LOOKUPFLW(user)] has emagged the emergency shuttle [time] seconds before launch.")
 	log_game("[key_name(user)] has emagged the emergency shuttle in [COORD(src)] [time] seconds before launch.")
 
 	ENABLE_BITFIELD(obj_flags, EMAGGED)
diff --git a/code/modules/surgery/organs/augments_arms.dm b/code/modules/surgery/organs/augments_arms.dm
index e2474742531..90270329962 100644
--- a/code/modules/surgery/organs/augments_arms.dm
+++ b/code/modules/surgery/organs/augments_arms.dm
@@ -187,9 +187,9 @@
 /obj/item/organ/cyberimp/arm/toolset/l
 	zone = BODY_ZONE_L_ARM
 
-/obj/item/organ/cyberimp/arm/toolset/emag_act()
+/obj/item/organ/cyberimp/arm/toolset/emag_act(mob/user)
 	if(!(locate(/obj/item/kitchen/knife/combat/cyborg) in items_list))
-		to_chat(usr, "<span class='notice'>You unlock [src]'s integrated knife!</span>")
+		to_chat(user, "<span class='notice'>You unlock [src]'s integrated knife!</span>")
 		items_list += new /obj/item/kitchen/knife/combat/cyborg(src)
 		return 1
 	return 0