diff --git a/code/__DEFINES/math.dm b/code/__DEFINES/math.dm
index 433d1c55b56..b255027d60d 100644
--- a/code/__DEFINES/math.dm
+++ b/code/__DEFINES/math.dm
@@ -236,3 +236,6 @@
 		return round(num--)
 	else
 		return num
+
+/// Checks if a number is an integer, or a float
+#define IS_INT(x) (x == round(x))
diff --git a/code/game/objects/items/stacks/stack.dm b/code/game/objects/items/stacks/stack.dm
index 22ac670b293..f443d97815d 100644
--- a/code/game/objects/items/stacks/stack.dm
+++ b/code/game/objects/items/stacks/stack.dm
@@ -187,7 +187,8 @@
 
 		var/datum/stack_recipe/R = recipes_list[text2num(href_list["make"])]
 		var/multiplier = text2num(href_list["multiplier"])
-		if(!multiplier || multiplier <= 0 || multiplier > 50) // Href exploit checks
+		if(!multiplier || multiplier <= 0 || multiplier > 50 || !IS_INT(multiplier)) // Href exploit checks
+			message_admins("[key_name_admin(usr)] just attempted to href exploit sheet crafting with an invalid multiplier. Ban highly advised.")
 			multiplier = 1
 
 		if(get_amount() < R.req_amount * multiplier)