Fix a bunch of runtimes

code/modules/research/protolathe.dm

@@ -199,8 +199,9 @@ Note: Must be placed west/left of and R&D console to function.
 	busy = 0
 	src.updateUsrDialog()
 
-	src.overlays += "protolathe_[stack.name]"
-	sleep(10)
-	src.overlays -= "protolathe_[stack.name]"
+	if(stack)
+		src.overlays += "protolathe_[stack.name]"
+		sleep(10)
+		src.overlays -= "protolathe_[stack.name]"
 
 	return

code/modules/research/xenoarchaeology/artifact/artifact.dm

@@ -66,8 +66,9 @@
 
 /obj/structure/boulder/attackby(obj/item/weapon/W as obj, mob/user as mob)
 	if (istype(W, /obj/item/device/core_sampler))
-		src.geological_data.artifact_distance = rand(-100,100) / 100
-		src.geological_data.artifact_id = artifact_find.artifact_id
+		if(geological_data)
+			src.geological_data.artifact_distance = rand(-100,100) / 100
+			src.geological_data.artifact_id = artifact_find.artifact_id
 
 		var/obj/item/device/core_sampler/C = W
 		C.sample_item(src, user)

code/modules/research/xenoarchaeology/finds/finds.dm

@@ -544,12 +544,14 @@
 
 		if(talkative)
 			new_item.talking_atom = new()
-			talking_atom.holder_atom = new_item
-			talking_atom.init()
+			if(talking_atom)
+				talking_atom.holder_atom = new_item
+				talking_atom.init()
 
 		del(src)
 
 	else if(talkative)
 		src.talking_atom = new()
-		talking_atom.holder_atom = src
-		talking_atom.init()
+		if(talking_atom)
+			talking_atom.holder_atom = src
+			talking_atom.init()