Merge pull request #13658 from Heroman3003/stackruntime

fixes runtime with stack dna transfer

code/game/objects/items/stacks/stack.dm

@@ -286,16 +286,16 @@
 	if(new_amount < 0 || new_amount % 1)
 		stack_trace("Tried to set a bad stack amount: [new_amount]")
 		return 0
-	
+
 	// Clean up the new amount
 	new_amount = max(round(new_amount), 0)
-	
+
 	// Can exceed max if you really want
 	if(new_amount > max_amount && !no_limits)
 		new_amount = max_amount
-	
+
 	amount = new_amount
-	
+
 	// Can set it to 0 without qdel if you really want
 	if(amount == 0 && !no_limits)
 		qdel(src)
@@ -320,7 +320,7 @@
 
 	if (isnull(tamount))
 		tamount = src.get_amount()
-	
+
 	if(tamount < 0 || tamount % 1)
 		stack_trace("Tried to transfer a bad stack amount: [tamount]")
 		return 0
@@ -333,7 +333,10 @@
 		if (prob(transfer/orig_amount * 100))
 			transfer_fingerprints_to(S)
 			if(blood_DNA)
-				S.blood_DNA |= blood_DNA
+				if(S.blood_DNA)
+					S.blood_DNA |= blood_DNA
+				else
+					S.blood_DNA = blood_DNA.Copy()
 		return transfer
 	return 0
 
@@ -347,7 +350,7 @@
 	if(tamount < 0 || tamount % 1)
 		stack_trace("Tried to split a bad stack amount: [tamount]")
 		return null
-	
+
 	var/transfer = max(min(tamount, src.amount, initial(max_amount)), 0)
 
 	var/orig_amount = src.amount

code/game/objects/items/weapons/material/whetstone.dm

@@ -9,7 +9,7 @@
 	w_class = ITEMSIZE_SMALL
 	var/repair_amount = 5
 	var/repair_time = 40
-	
+
 /obj/item/weapon/whetstone/attackby(obj/item/I, mob/user)
 	if(istype(I, /obj/item/stack/material))
 		var/obj/item/stack/material/M = I
@@ -43,7 +43,7 @@
 	. = ..()
 	. += "There [uses == 1 ? "is" : "are"] [uses] [material] [uses == 1 ? src.material.sheet_singular_name : src.material.sheet_plural_name] left for use."
 
-/obj/item/weapon/material/sharpeningkit/Initialize()
+/obj/item/weapon/material/sharpeningkit/New()
 	. = ..()
 	setrepair()
 
@@ -74,4 +74,4 @@
 			to_chat(user, "There's not enough spare sheets to sharpen [M]. You need [M.w_class*2] [M.material.sheet_plural_name].")
 			return
 	else
-		to_chat(user, "You can't sharpen [W] with [src]!") 
+		to_chat(user, "You can't sharpen [W] with [src]!")