diff --git a/src/main/java/org/teacon/powertool/block/ItemSupplierBlock.java b/src/main/java/org/teacon/powertool/block/ItemSupplierBlock.java
index cfa2514..f1d764d 100644
--- a/src/main/java/org/teacon/powertool/block/ItemSupplierBlock.java
+++ b/src/main/java/org/teacon/powertool/block/ItemSupplierBlock.java
@@ -70,7 +70,7 @@ public void attack(BlockState state, Level level, BlockPos pos, Player player) {
     @Override
     public InteractionResult use(BlockState state, Level level, BlockPos pos, Player player, InteractionHand hand, BlockHitResult hit) {
         if (level.getBlockEntity(pos) instanceof ItemSupplierBlockEntity theBE) {
-            if (player.getAbilities().instabuild) {
+            if (theBE.theItem.isEmpty() && player.getAbilities().instabuild) {
                 theBE.theItem = player.getItemInHand(hand).copy();
                 if (!level.isClientSide) {
                     theBE.setChanged();
diff --git a/src/main/resources/assets/powertool/lang/en_us.json b/src/main/resources/assets/powertool/lang/en_us.json
index f7bb0f1..615156f 100644
--- a/src/main/resources/assets/powertool/lang/en_us.json
+++ b/src/main/resources/assets/powertool/lang/en_us.json
@@ -3,7 +3,7 @@
   "block.powertool.power_supply": "Power Supply",
   "block.powertool.trash_can": "Trash Can",
   "block.powertool.item_supplier": "Item Supplier",
-  "block.powertool.item_supplier.tooltip": "In creative mode, right-click to put held items in. In other modes, left-click or right-click to get unlimited items out.",
+  "block.powertool.item_supplier.tooltip": "In creative mode, right-click to permanently put held items in. After that, left-click or right-click to get unlimited items out.",
   "block.powertool.cosmetic_hopper": "Hopper (Cosmetic)",
   "block.powertool.cosmetic_hopper.tooltip": "No functionality, safe for buildings",
   "block.powertool.cosmetic_campfire": "Campfire (Cosmetic)",
diff --git a/src/main/resources/assets/powertool/lang/zh_cn.json b/src/main/resources/assets/powertool/lang/zh_cn.json
index ab69328..c19a778 100644
--- a/src/main/resources/assets/powertool/lang/zh_cn.json
+++ b/src/main/resources/assets/powertool/lang/zh_cn.json
@@ -3,7 +3,7 @@
   "block.powertool.power_supply": "电源",
   "block.powertool.trash_can": "垃圾桶",
   "block.powertool.item_supplier": "供货箱",
-  "block.powertool.item_supplier.tooltip": "创造模式下右击放入物品，其他模式下左击右击都可以取出不限量物品。",
+  "block.powertool.item_supplier.tooltip": "创造模式下右击永久放入物品，此后不论左击右击都可以取出不限量物品。",
   "block.powertool.cosmetic_hopper": "漏斗（装饰品）",
   "block.powertool.cosmetic_hopper.tooltip": "没有实际功能，可放心在建筑中使用",
   "block.powertool.cosmetic_campfire": "营火（装饰品）",