diff --git a/code/game/objects/items/weapons/RMS.dm b/code/game/objects/items/weapons/RMS.dm
index 5d86d85a26..52dd09ed20 100644
--- a/code/game/objects/items/weapons/RMS.dm
+++ b/code/game/objects/items/weapons/RMS.dm
@@ -189,7 +189,13 @@ GLOBAL_LIST_INIT(RMS_random_malfunction, list(/obj/item/fbp_backup_cell,
 	var/list/banned_sheet_materials = list(
 		/obj/item/stack/material/supermatter,
 		/obj/item/stack/material/glamour,
-		/obj/item/stack/material/morphium
+		/obj/item/stack/material/morphium, //CHOMPAdd Start
+		/obj/item/stack/material/shellchitin,
+		/obj/item/stack/material/dreamscale,
+		/obj/item/stack/material/crystalscale,
+		/obj/item/stack/material/frostscale,
+		/obj/item/stack/material/wisp,
+		/obj/item/stack/material/weathered_agate //CHOMPAdd End
 		// Include if you enable in the .dme /obj/item/stack/material/debug
 		)
 	possible_object_paths -= banned_sheet_materials