diff --git a/internal/base/constant/cache_key.go b/internal/base/constant/cache_key.go
index c04e56e4..31b6b752 100644
--- a/internal/base/constant/cache_key.go
+++ b/internal/base/constant/cache_key.go
@@ -14,6 +14,7 @@ const (
 	SiteInfoCacheTime                          = 1 * time.Hour
 	ConfigID2KEYCacheKeyPrefix                 = "answer:config:id:"
 	ConfigKEY2ContentCacheKeyPrefix            = "answer:config:key:"
+	ConfigCacheTime                            = 1 * time.Hour
 	ConnectorUserExternalInfoCacheKey          = "answer:connector:"
 	ConnectorUserExternalInfoCacheTime         = 10 * time.Minute
 	SiteMapQuestionCacheKeyPrefix              = "answer:sitemap:question:%d"
diff --git a/internal/entity/config_entity.go b/internal/entity/config_entity.go
index 908903a1..c4275e51 100644
--- a/internal/entity/config_entity.go
+++ b/internal/entity/config_entity.go
@@ -2,6 +2,7 @@ package entity
 
 import (
 	"encoding/json"
+	"github.com/segmentfault/pacman/log"
 
 	"github.com/answerdev/answer/pkg/converter"
 )
@@ -33,6 +34,9 @@ func (c *Config) JsonString() string {
 
 // GetIntValue get int value
 func (c *Config) GetIntValue() int {
+	if len(c.Value) == 0 {
+		log.Warnf("config value is empty, key: %s, value: %s", c.Key, c.Value)
+	}
 	return converter.StringToInt(c.Value)
 }
 
diff --git a/internal/repo/config/config_repo.go b/internal/repo/config/config_repo.go
index 07f4ce7f..44128afc 100644
--- a/internal/repo/config/config_repo.go
+++ b/internal/repo/config/config_repo.go
@@ -28,7 +28,8 @@ func NewConfigRepo(data *data.Data) config.ConfigRepo {
 
 func (cr configRepo) GetConfigByID(ctx context.Context, id int) (c *entity.Config, err error) {
 	cacheKey := fmt.Sprintf("%s%d", constant.ConfigID2KEYCacheKeyPrefix, id)
-	if cacheData, exist, err := cr.data.Cache.GetString(ctx, cacheKey); err == nil && exist {
+	cacheData, exist, err := cr.data.Cache.GetString(ctx, cacheKey)
+	if err == nil && exist && len(cacheData) > 0 {
 		c = &entity.Config{}
 		c.BuildByJSON([]byte(cacheData))
 		if c.ID > 0 {
@@ -37,7 +38,7 @@ func (cr configRepo) GetConfigByID(ctx context.Context, id int) (c *entity.Confi
 	}
 
 	c = &entity.Config{}
-	exist, err := cr.data.DB.Context(ctx).ID(id).Get(c)
+	exist, err = cr.data.DB.Context(ctx).ID(id).Get(c)
 	if err != nil {
 		return nil, errors.InternalServer(reason.DatabaseError).WithError(err).WithStack()
 	}
@@ -46,7 +47,7 @@ func (cr configRepo) GetConfigByID(ctx context.Context, id int) (c *entity.Confi
 	}
 
 	// update cache
-	if err := cr.data.Cache.SetString(ctx, cacheKey, c.JsonString(), -1); err != nil {
+	if err := cr.data.Cache.SetString(ctx, cacheKey, c.JsonString(), constant.ConfigCacheTime); err != nil {
 		log.Error(err)
 	}
 	return c, nil
@@ -54,7 +55,8 @@ func (cr configRepo) GetConfigByID(ctx context.Context, id int) (c *entity.Confi
 
 func (cr configRepo) GetConfigByKey(ctx context.Context, key string) (c *entity.Config, err error) {
 	cacheKey := constant.ConfigKEY2ContentCacheKeyPrefix + key
-	if cacheData, exist, err := cr.data.Cache.GetString(ctx, cacheKey); err == nil && exist {
+	cacheData, exist, err := cr.data.Cache.GetString(ctx, cacheKey)
+	if err == nil && exist && len(cacheData) > 0 {
 		c = &entity.Config{}
 		c.BuildByJSON([]byte(cacheData))
 		if c.ID > 0 {
@@ -63,7 +65,7 @@ func (cr configRepo) GetConfigByKey(ctx context.Context, key string) (c *entity.
 	}
 
 	c = &entity.Config{Key: key}
-	exist, err := cr.data.DB.Context(ctx).Get(c)
+	exist, err = cr.data.DB.Context(ctx).Get(c)
 	if err != nil {
 		return nil, errors.InternalServer(reason.DatabaseError).WithError(err).WithStack()
 	}
@@ -72,7 +74,7 @@ func (cr configRepo) GetConfigByKey(ctx context.Context, key string) (c *entity.
 	}
 
 	// update cache
-	if err := cr.data.Cache.SetString(ctx, cacheKey, c.JsonString(), -1); err != nil {
+	if err := cr.data.Cache.SetString(ctx, cacheKey, c.JsonString(), constant.ConfigCacheTime); err != nil {
 		log.Error(err)
 	}
 	return c, nil
@@ -99,11 +101,11 @@ func (cr configRepo) UpdateConfig(ctx context.Context, key string, value string)
 	cacheVal := oldConfig.JsonString()
 	// update cache
 	if err := cr.data.Cache.SetString(ctx,
-		constant.ConfigKEY2ContentCacheKeyPrefix+key, cacheVal, -1); err != nil {
+		constant.ConfigKEY2ContentCacheKeyPrefix+key, cacheVal, constant.ConfigCacheTime); err != nil {
 		log.Error(err)
 	}
 	if err := cr.data.Cache.SetString(ctx,
-		fmt.Sprintf("%s%d", constant.ConfigID2KEYCacheKeyPrefix, oldConfig.ID), cacheVal, -1); err != nil {
+		fmt.Sprintf("%s%d", constant.ConfigID2KEYCacheKeyPrefix, oldConfig.ID), cacheVal, constant.ConfigCacheTime); err != nil {
 		log.Error(err)
 	}
 	return