diff --git a/blockindex/contractstaking/cache.go b/blockindex/contractstaking/cache.go
index 68ca596fda..fad4b39af4 100644
--- a/blockindex/contractstaking/cache.go
+++ b/blockindex/contractstaking/cache.go
@@ -25,7 +25,7 @@ type (
 		BucketInfo(id uint64) (*bucketInfo, bool)
 		MustGetBucketInfo(id uint64) *bucketInfo
 		MustGetBucketType(id uint64) *BucketType
-		MatchBucketType(amount *big.Int, duration uint64) (uint64, *BucketType, bool)
+		MatchBucketType(amount *big.Int, duration uint64) (uint64, *BucketType)
 		BucketType(id uint64) (*BucketType, bool)
 		BucketTypeCount() int
 		Buckets() ([]uint64, []*BucketType, []*bucketInfo)
@@ -210,15 +210,15 @@ func (s *contractStakingCache) DeleteBucketInfo(id uint64) {
 	s.deltaBuckets[id] = nil
 }
 
-func (s *contractStakingCache) MatchBucketType(amount *big.Int, duration uint64) (uint64, *BucketType, bool) {
+func (s *contractStakingCache) MatchBucketType(amount *big.Int, duration uint64) (uint64, *BucketType) {
 	s.mutex.RLock()
 	defer s.mutex.RUnlock()
 
 	id, ok := s.getBucketTypeIndex(amount, duration)
 	if !ok {
-		return 0, nil, false
+		return 0, nil
 	}
-	return id, s.mustGetBucketType(id), true
+	return id, s.mustGetBucketType(id)
 }
 
 func (s *contractStakingCache) LoadFromDB(kvstore db.KVStore) error {
diff --git a/blockindex/contractstaking/cache_test.go b/blockindex/contractstaking/cache_test.go
index f96d609908..41893b0276 100644
--- a/blockindex/contractstaking/cache_test.go
+++ b/blockindex/contractstaking/cache_test.go
@@ -376,33 +376,29 @@ func TestContractStakingCache_MatchBucketType(t *testing.T) {
 	cache := newContractStakingCache()
 
 	// no bucket types
-	_, bucketType, ok := cache.MatchBucketType(big.NewInt(100), 100)
-	require.False(ok)
+	_, bucketType := cache.MatchBucketType(big.NewInt(100), 100)
 	require.Nil(bucketType)
 
 	// one bucket type
 	cache.PutBucketType(1, &BucketType{Amount: big.NewInt(100), Duration: 100, ActivatedAt: 1})
 	// match exact bucket type
-	id, bucketType, ok := cache.MatchBucketType(big.NewInt(100), 100)
-	require.True(ok)
+	id, bucketType := cache.MatchBucketType(big.NewInt(100), 100)
+	require.NotNil(bucketType)
 	require.EqualValues(1, id)
 	require.EqualValues(100, bucketType.Amount.Int64())
 	require.EqualValues(100, bucketType.Duration)
 	require.EqualValues(1, bucketType.ActivatedAt)
 
 	// match bucket type with different amount
-	_, bucketType, ok = cache.MatchBucketType(big.NewInt(200), 100)
-	require.False(ok)
+	_, bucketType = cache.MatchBucketType(big.NewInt(200), 100)
 	require.Nil(bucketType)
 
 	// match bucket type with different duration
-	_, bucketType, ok = cache.MatchBucketType(big.NewInt(100), 200)
-	require.False(ok)
+	_, bucketType = cache.MatchBucketType(big.NewInt(100), 200)
 	require.Nil(bucketType)
 
 	// no match
-	_, bucketType, ok = cache.MatchBucketType(big.NewInt(200), 200)
-	require.False(ok)
+	_, bucketType = cache.MatchBucketType(big.NewInt(200), 200)
 	require.Nil(bucketType)
 }
 
@@ -533,8 +529,8 @@ func TestContractStakingCache_LoadFromDB(t *testing.T) {
 	require.Equal(bucketInfo, bi)
 	btc = cache.BucketTypeCount()
 	require.EqualValues(1, btc)
-	id, bt, ok := cache.MatchBucketType(big.NewInt(100), 100)
-	require.True(ok)
+	id, bt := cache.MatchBucketType(big.NewInt(100), 100)
+	require.NotNil(bt)
 	require.EqualValues(1, id)
 	require.EqualValues(100, bt.Amount.Int64())
 	require.EqualValues(100, bt.Duration)
diff --git a/blockindex/contractstaking/dirty_cache.go b/blockindex/contractstaking/dirty_cache.go
index 8f2ce90972..88a04cd0c3 100644
--- a/blockindex/contractstaking/dirty_cache.go
+++ b/blockindex/contractstaking/dirty_cache.go
@@ -73,8 +73,8 @@ func (dirty *contractStakingDirty) deleteBucketInfo(id uint64) {
 }
 
 func (dirty *contractStakingDirty) putBucketType(bt *BucketType) {
-	id, _, ok := dirty.matchBucketType(bt.Amount, bt.Duration)
-	if !ok {
+	id, old := dirty.matchBucketType(bt.Amount, bt.Duration)
+	if old == nil {
 		id = dirty.getBucketTypeCount()
 		dirty.addBucketType(id, bt)
 	}
@@ -112,7 +112,7 @@ func (dirty *contractStakingDirty) addBucketType(id uint64, bt *BucketType) {
 	dirty.cache.PutBucketType(id, bt)
 }
 
-func (dirty *contractStakingDirty) matchBucketType(amount *big.Int, duration uint64) (uint64, *BucketType, bool) {
+func (dirty *contractStakingDirty) matchBucketType(amount *big.Int, duration uint64) (uint64, *BucketType) {
 	return dirty.cache.MatchBucketType(amount, duration)
 }
 
diff --git a/blockindex/contractstaking/dirty_cache_test.go b/blockindex/contractstaking/dirty_cache_test.go
index b6070a28d6..9d6736bb37 100644
--- a/blockindex/contractstaking/dirty_cache_test.go
+++ b/blockindex/contractstaking/dirty_cache_test.go
@@ -96,15 +96,14 @@ func TestContractStakingDirty_matchBucketType(t *testing.T) {
 	dirty := newContractStakingDirty(clean)
 
 	// no bucket type
-	id, bt, ok := dirty.matchBucketType(big.NewInt(100), 100)
-	require.False(ok)
+	id, bt := dirty.matchBucketType(big.NewInt(100), 100)
 	require.Nil(bt)
 	require.EqualValues(0, id)
 
 	// bucket type in clean cache
 	clean.PutBucketType(1, &BucketType{Amount: big.NewInt(100), Duration: 100, ActivatedAt: 1})
-	id, bt, ok = dirty.matchBucketType(big.NewInt(100), 100)
-	require.True(ok)
+	id, bt = dirty.matchBucketType(big.NewInt(100), 100)
+	require.NotNil(bt)
 	require.EqualValues(100, bt.Amount.Int64())
 	require.EqualValues(100, bt.Duration)
 	require.EqualValues(1, bt.ActivatedAt)
@@ -112,8 +111,8 @@ func TestContractStakingDirty_matchBucketType(t *testing.T) {
 
 	// added bucket type
 	dirty.addBucketType(2, &BucketType{Amount: big.NewInt(200), Duration: 200, ActivatedAt: 2})
-	id, bt, ok = dirty.matchBucketType(big.NewInt(200), 200)
-	require.True(ok)
+	id, bt = dirty.matchBucketType(big.NewInt(200), 200)
+	require.NotNil(bt)
 	require.EqualValues(200, bt.Amount.Int64())
 	require.EqualValues(200, bt.Duration)
 	require.EqualValues(2, bt.ActivatedAt)
diff --git a/blockindex/contractstaking/event_handler.go b/blockindex/contractstaking/event_handler.go
index c9b4aae092..abcea1db29 100644
--- a/blockindex/contractstaking/event_handler.go
+++ b/blockindex/contractstaking/event_handler.go
@@ -491,8 +491,8 @@ func (eh *contractStakingEventHandler) handleBucketTypeDeactivatedEvent(event ev
 		return err
 	}
 
-	id, bt, ok := eh.dirty.matchBucketType(amountParam, durationParam.Uint64())
-	if !ok {
+	id, bt := eh.dirty.matchBucketType(amountParam, durationParam.Uint64())
+	if bt == nil {
 		return errors.Wrapf(errBucketTypeNotExist, "amount %d, duration %d", amountParam.Int64(), durationParam.Uint64())
 	}
 	bt.ActivatedAt = maxBlockNumber
@@ -519,8 +519,8 @@ func (eh *contractStakingEventHandler) handleStakedEvent(event eventParam, heigh
 		return err
 	}
 
-	btIdx, _, ok := eh.dirty.matchBucketType(amountParam, durationParam.Uint64())
-	if !ok {
+	btIdx, bt := eh.dirty.matchBucketType(amountParam, durationParam.Uint64())
+	if bt == nil {
 		return errors.Wrapf(errBucketTypeNotExist, "amount %d, duration %d", amountParam.Int64(), durationParam.Uint64())
 	}
 	owner, ok := eh.tokenOwner[tokenIDParam.Uint64()]
@@ -557,8 +557,8 @@ func (eh *contractStakingEventHandler) handleLockedEvent(event eventParam) error
 	if !ok {
 		return errors.Wrapf(errBucketTypeNotExist, "id %d", b.TypeIndex)
 	}
-	newBtIdx, _, ok := eh.dirty.matchBucketType(bt.Amount, durationParam.Uint64())
-	if !ok {
+	newBtIdx, newBt := eh.dirty.matchBucketType(bt.Amount, durationParam.Uint64())
+	if newBt == nil {
 		return errors.Wrapf(errBucketTypeNotExist, "amount %v, duration %d", bt.Amount, durationParam.Uint64())
 	}
 	b.TypeIndex = newBtIdx
@@ -615,8 +615,8 @@ func (eh *contractStakingEventHandler) handleMergedEvent(event eventParam) error
 	}
 
 	// merge to the first bucket
-	btIdx, _, ok := eh.dirty.matchBucketType(amountParam, durationParam.Uint64())
-	if !ok {
+	btIdx, bt := eh.dirty.matchBucketType(amountParam, durationParam.Uint64())
+	if bt == nil {
 		return errors.Wrapf(errBucketTypeNotExist, "amount %d, duration %d", amountParam.Int64(), durationParam.Uint64())
 	}
 	b, ok := eh.dirty.getBucketInfo(tokenIDsParam[0].Uint64())
@@ -651,8 +651,8 @@ func (eh *contractStakingEventHandler) handleBucketExpandedEvent(event eventPara
 	if !ok {
 		return errors.Wrapf(ErrBucketNotExist, "token id %d", tokenIDParam.Uint64())
 	}
-	newBtIdx, _, ok := eh.dirty.matchBucketType(amountParam, durationParam.Uint64())
-	if !ok {
+	newBtIdx, newBucketType := eh.dirty.matchBucketType(amountParam, durationParam.Uint64())
+	if newBucketType == nil {
 		return errors.Wrapf(errBucketTypeNotExist, "amount %d, duration %d", amountParam.Int64(), durationParam.Uint64())
 	}
 	b.TypeIndex = newBtIdx
diff --git a/blockindex/contractstaking/indexer.go b/blockindex/contractstaking/indexer.go
index d9adc6dfc8..7e21fe5bf2 100644
--- a/blockindex/contractstaking/indexer.go
+++ b/blockindex/contractstaking/indexer.go
@@ -128,8 +128,8 @@ func (s *Indexer) LoadStakeView(ctx context.Context, sr protocol.StateReader) (s
 		if buckets[i] == nil {
 			return nil, errors.New("bucket is nil")
 		}
-		tid, _, ok := cache.MatchBucketType(buckets[i].StakedAmount, buckets[i].StakedDuration)
-		if !ok {
+		tid, bt := cache.MatchBucketType(buckets[i].StakedAmount, buckets[i].StakedDuration)
+		if bt == nil {
 			return nil, errors.Errorf(
 				"no bucket type found for bucket %d with staked amount %s and duration %d",
 				id,
diff --git a/blockindex/contractstaking/wrappedcache.go b/blockindex/contractstaking/wrappedcache.go
index 226e6ea074..7ce7f15324 100644
--- a/blockindex/contractstaking/wrappedcache.go
+++ b/blockindex/contractstaking/wrappedcache.go
@@ -198,8 +198,8 @@ func (wc *wrappedCache) PutBucketType(id uint64, bt *BucketType) {
 			panic("bucket type amount or duration cannot be changed")
 		}
 	}
-	oldId, _, ok := wc.matchBucketType(bt.Amount, bt.Duration)
-	if ok && oldId != id {
+	oldId, oldBucketType := wc.matchBucketType(bt.Amount, bt.Duration)
+	if oldBucketType != nil && oldId != id {
 		panic("bucket type with same amount and duration already exists")
 	}
 	if _, ok := wc.propertyBucketTypeMap[bt.Amount.Uint64()]; !ok {
@@ -313,21 +313,21 @@ func (wc *wrappedCache) DeleteBucketInfo(id uint64) {
 	wc.updatedBucketInfos[id] = nil
 }
 
-func (wc *wrappedCache) MatchBucketType(amount *big.Int, duration uint64) (uint64, *BucketType, bool) {
+func (wc *wrappedCache) MatchBucketType(amount *big.Int, duration uint64) (uint64, *BucketType) {
 	wc.mu.RLock()
 	defer wc.mu.RUnlock()
 	return wc.matchBucketType(amount, duration)
 }
 
-func (wc *wrappedCache) matchBucketType(amount *big.Int, duration uint64) (uint64, *BucketType, bool) {
+func (wc *wrappedCache) matchBucketType(amount *big.Int, duration uint64) (uint64, *BucketType) {
 	amountUint64 := amount.Uint64()
 	if amountMap, ok := wc.propertyBucketTypeMap[amountUint64]; ok {
 		if id, ok := amountMap[duration]; ok {
 			if bt, ok := wc.updatedBucketTypes[id]; ok {
 				if bt != nil {
-					return id, bt, true
+					return id, bt
 				}
-				return 0, nil, false
+				return 0, nil
 			}
 		}
 	}