diff --git a/.Lib9c.Tests/Action/AdventureBoss/SweepAdventureBossTest.cs b/.Lib9c.Tests/Action/AdventureBoss/SweepAdventureBossTest.cs
index 3021ca8bf8..f6295e64f9 100644
--- a/.Lib9c.Tests/Action/AdventureBoss/SweepAdventureBossTest.cs
+++ b/.Lib9c.Tests/Action/AdventureBoss/SweepAdventureBossTest.cs
@@ -99,7 +99,7 @@ public static IEnumerable<object[]> GetExecuteMemberData()
             };
             yield return new object[]
             {
-                1, 0, 0, typeof(NotEnoughMaterialException), null,
+                1, 1, 1, typeof(NotEnoughMaterialException), null,
             };
             yield return new object[]
             {
diff --git a/.Lib9c.Tests/Action/Summon/AuraSummonTest.cs b/.Lib9c.Tests/Action/Summon/AuraSummonTest.cs
index 1fe7a4ab74..06dd895202 100644
--- a/.Lib9c.Tests/Action/Summon/AuraSummonTest.cs
+++ b/.Lib9c.Tests/Action/Summon/AuraSummonTest.cs
@@ -134,7 +134,7 @@ public void CumulativeRatio(string version, int groupId)
             9,
             800201,
             9,
-            0,
+            2,
             new[] { 10610000, 10610000, 10610000, 10610000, 10610000, 10610000, 10620000, 10620000, 10620000, },
             null
         )]
@@ -144,7 +144,7 @@ public void CumulativeRatio(string version, int groupId)
             9,
             600201,
             9,
-            0,
+            1,
             new[] { 10620001, 10620001, 10620001, 10620001, 10620001, 10630001, 10630001, 10630001, 10630001, },
             null
         )]
@@ -155,7 +155,7 @@ public void CumulativeRatio(string version, int groupId)
             10,
             800201,
             10,
-            0,
+            1,
             new[] { 10610000, 10610000, 10610000, 10610000, 10610000, 10610000, 10610000, 10610000, 10620000, 10620000, 10620000, },
             null
         )]
@@ -165,15 +165,15 @@ public void CumulativeRatio(string version, int groupId)
             10,
             600201,
             10,
-            0,
+            2,
             new[] { 10620001, 10620001, 10620001, 10620001, 10620001, 10620001, 10630001, 10620001, 10630001, 10630001, 10630001, },
             null
         )]
         // fail by invalid group
-        [InlineData("V1", 100003, 1, null, 0, 0, new int[] { }, typeof(RowNotInTableException))]
+        [InlineData("V1", 100003, 1, null, 0, 1, new int[] { }, typeof(RowNotInTableException))]
         // fail by not enough material
-        [InlineData("V1", 10001, 1, 800201, 0, 0, new int[] { }, typeof(NotEnoughMaterialException))]
-        [InlineData("V1", 10001, 2, 800201, 0, 0, new int[] { }, typeof(NotEnoughMaterialException))]
+        [InlineData("V1", 10001, 1, 800201, 0, 2, new int[] { }, typeof(NotEnoughMaterialException))]
+        [InlineData("V1", 10001, 2, 800201, 0, 1, new int[] { }, typeof(NotEnoughMaterialException))]
         // Fail by exceeding summon limit
         [InlineData("V1", 10001, 11, 800201, 22, 1, new int[] { }, typeof(InvalidSummonCountException))]
         // 15 recipes
diff --git a/.Lib9c.Tests/Action/Summon/RuneSummonTest.cs b/.Lib9c.Tests/Action/Summon/RuneSummonTest.cs
index 08ec4c6e4f..21d4aa28f5 100644
--- a/.Lib9c.Tests/Action/Summon/RuneSummonTest.cs
+++ b/.Lib9c.Tests/Action/Summon/RuneSummonTest.cs
@@ -208,7 +208,7 @@ private class ExecuteMemeber : IEnumerable<object[]>
                     9,
                     600201,
                     9,
-                    0,
+                    2,
                     null,
                 },
                 // Ten plus one
@@ -218,7 +218,7 @@ private class ExecuteMemeber : IEnumerable<object[]>
                     10,
                     600201,
                     10,
-                    0,
+                    1,
                     null,
                 },
                 // fail by invalid group
diff --git a/.Lib9c.Tests/Model/Item/InventoryTest.cs b/.Lib9c.Tests/Model/Item/InventoryTest.cs
index acc3d25385..3204e7bafa 100644
--- a/.Lib9c.Tests/Model/Item/InventoryTest.cs
+++ b/.Lib9c.Tests/Model/Item/InventoryTest.cs
@@ -4,6 +4,7 @@
     using System.Collections.Generic;
     using System.Linq;
     using Lib9c.Tests.Action;
+    using Nekoyume.Action;
     using Nekoyume.Model.Item;
     using Nekoyume.TableData;
     using Xunit;
@@ -34,6 +35,19 @@ public void Serialize()
         }
 
         // Add
+        [Fact]
+        public void AddItemZero()
+        {
+            var item = GetFirstConsumable();
+            var inventory = new Inventory();
+            Assert.Empty(inventory.Items);
+
+            Assert.Throws<InvalidItemCountException>(() =>
+            {
+                inventory.AddItem(item, 0);
+            });
+        }
+
         [Fact]
         public Inventory AddItem_Consumable()
         {
diff --git a/Lib9c/Model/Item/Inventory.cs b/Lib9c/Model/Item/Inventory.cs
index d134342cf4..4eb4e9b9bc 100644
--- a/Lib9c/Model/Item/Inventory.cs
+++ b/Lib9c/Model/Item/Inventory.cs
@@ -175,6 +175,11 @@ public object Clone()
 
         public KeyValuePair<int, int> AddItem(ItemBase itemBase, int count = 1, ILock iLock = null)
         {
+            if(count == 0)
+            {
+                throw new InvalidItemCountException();
+            }
+
             switch (itemBase.ItemType)
             {
                 case ItemType.Consumable: