diff --git a/code/modules/reagents/Chemistry-Machinery.dm b/code/modules/reagents/Chemistry-Machinery.dm
index 29484c06..7d9098d2 100644
--- a/code/modules/reagents/Chemistry-Machinery.dm
+++ b/code/modules/reagents/Chemistry-Machinery.dm
@@ -345,6 +345,7 @@
 			if(href_list["amount"])
 				var/id = href_list["add"]
 				var/amount = text2num(href_list["amount"])
+				amount = isgoodnumber(amount) //Sanity check hrefs people -Scopes
 				R.trans_id_to(src, id, amount)
 
 		else if (href_list["addcustom"])
@@ -359,6 +360,7 @@
 			if(href_list["amount"])
 				var/id = href_list["remove"]
 				var/amount = text2num(href_list["amount"])
+				amount = isgoodnumber(amount) //Sanity check hrefs people -Scopes
 				if(mode)
 					reagents.trans_id_to(beaker, id, amount)
 				else
@@ -1232,4 +1234,4 @@
 			target.apply_damage(10, HALLOSS)
 			target.say("*scream")
 			spawn(10)
-			user.visible_message("\red [user] stops the [src] and leaves [target] resting as they are.", "\red You turn the [src] off and let go of [target].")
\ No newline at end of file
+			user.visible_message("\red [user] stops the [src] and leaves [target] resting as they are.", "\red You turn the [src] off and let go of [target].")