diff --git a/code/__DEFINES/is_helpers.dm b/code/__DEFINES/is_helpers.dm
index 67a6a8c2f9d..9ff6c8e84d2 100644
--- a/code/__DEFINES/is_helpers.dm
+++ b/code/__DEFINES/is_helpers.dm
@@ -172,7 +172,7 @@ GLOBAL_LIST_INIT(turfs_without_ground, typecacheof(list(
 
 #define ismecha(A) (istype(A, /obj/mecha))
 
-#define ismopable(A) (A.layer <= HIGH_SIGIL_LAYER) //If something can be cleaned by floor-cleaning devices such as mops or clean bots
+#define ismopable(A) (A && (A.layer <= HIGH_SIGIL_LAYER)) //If something can be cleaned by floor-cleaning devices such as mops or clean bots
 
 #define isorgan(A) (istype(A, /obj/item/organ))
 
diff --git a/code/modules/reagents/chemistry/reagents/other_reagents.dm b/code/modules/reagents/chemistry/reagents/other_reagents.dm
index cd42a1a1c5c..5393c9afaee 100644
--- a/code/modules/reagents/chemistry/reagents/other_reagents.dm
+++ b/code/modules/reagents/chemistry/reagents/other_reagents.dm
@@ -1072,7 +1072,7 @@
 	if(reac_volume >= 1)
 		T.wash(clean_types)
 		for(var/am in T)
-			var/atom/movable/movable_content
+			var/atom/movable/movable_content = am
 			if(ismopable(movable_content)) // Mopables will be cleaned anyways by the turf wash
 				continue
 			movable_content.wash(clean_types)