diff --git a/src/Coordination/SnapshotableHashTable.h b/src/Coordination/SnapshotableHashTable.h
index d1ed7d822aa..42d1c297efb 100644
--- a/src/Coordination/SnapshotableHashTable.h
+++ b/src/Coordination/SnapshotableHashTable.h
@@ -192,6 +192,7 @@ public:
             return false;
 
         auto list_itr = it->second;
+        UInt64 old_data_size = sizeOf<V>(&list_itr->value);
         if (snapshot_mode)
         {
             list_itr->active_in_map = false;
@@ -203,7 +204,7 @@ public:
             list.erase(list_itr);
         }
 
-        updateDataSize(ERASE, sizeOf<std::string>(&key), 0, sizeOf<V>(&list_itr->value));
+        updateDataSize(ERASE, sizeOf<std::string>(&key), 0, old_data_size);
         return true;
     }
 
diff --git a/src/Coordination/tests/gtest_coordination.cpp b/src/Coordination/tests/gtest_coordination.cpp
index 22a0dfcdbaa..0b8c9809085 100644
--- a/src/Coordination/tests/gtest_coordination.cpp
+++ b/src/Coordination/tests/gtest_coordination.cpp
@@ -963,6 +963,7 @@ TEST_P(CoordinationTest, SnapshotableHashMapDataSize)
     n1.data = "1234";
     Node n2;
     n2.data = "123456";
+    n2.children.insert("");
 
     world.disableSnapshotMode();
     world.insert("world", n1);
@@ -974,7 +975,7 @@ TEST_P(CoordinationTest, SnapshotableHashMapDataSize)
     world.updateValue("world", [&](Node & value) { value = n2; });
     EXPECT_EQ(world.getApproximateSataSize(), 171);
 
-    world.clear();
+    world.erase("world");
     EXPECT_EQ(world.getApproximateSataSize(), 0);
 
     world.enableSnapshotMode();
@@ -985,6 +986,12 @@ TEST_P(CoordinationTest, SnapshotableHashMapDataSize)
 
     world.clearOutdatedNodes();
     EXPECT_EQ(world.getApproximateSataSize(), 171);
+
+    world.erase("world");
+    EXPECT_EQ(world.getApproximateSataSize(), 171);
+
+    world.clear();
+    EXPECT_EQ(world.getApproximateSataSize(), 0);
 }
 
 void addNode(DB::KeeperStorage & storage, const std::string & path, const std::string & data, int64_t ephemeral_owner=0)