diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/capability/MatteryPlayerCapability.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/capability/MatteryPlayerCapability.kt
index 9a1cd1caa..a0f31a2d1 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/capability/MatteryPlayerCapability.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/capability/MatteryPlayerCapability.kt
@@ -869,7 +869,7 @@ class MatteryPlayerCapability(val ply: Player) : ICapabilityProvider, INBTSerial
 		 */
 		@JvmStatic
 		fun inventoryAddItemHookPre(inventory: Inventory, item: ItemStack) {
-			if (item.isEmpty) {
+			if (item.isEmpty || !item.isStackable) {
 				return
 			}