diff --git a/middleware/distributor.go b/middleware/distributor.go
index e2b8f2a..74754f4 100644
--- a/middleware/distributor.go
+++ b/middleware/distributor.go
@@ -101,10 +101,12 @@ func Distribute() func(c *gin.Context) {
 			channel, err = model.CacheGetRandomSatisfiedChannel(userGroup, modelRequest.Model)
 			if err != nil {
 				message := fmt.Sprintf("当前分组 %s 下对于模型 %s 无可用渠道", userGroup, modelRequest.Model)
+				// 如果错误，但是渠道不为空，说明是数据库一致性问题
 				if channel != nil {
 					common.SysError(fmt.Sprintf("渠道不存在：%d", channel.Id))
 					message = "数据库一致性已被破坏，请联系管理员"
 				}
+				// 如果错误，而且渠道为空，说明是没有可用渠道
 				abortWithMessage(c, http.StatusServiceUnavailable, message)
 				return
 			}
diff --git a/model/ability.go b/model/ability.go
index 7a2cc39..c7875da 100644
--- a/model/ability.go
+++ b/model/ability.go
@@ -159,5 +159,6 @@ func FixAbility() (int, error) {
 			count++
 		}
 	}
+	InitChannelCache()
 	return count, nil
 }
diff --git a/model/cache.go b/model/cache.go
index a134ec0..5c9be39 100644
--- a/model/cache.go
+++ b/model/cache.go
@@ -258,8 +258,8 @@ func CacheGetRandomSatisfiedChannel(group string, model string) (*Channel, error
 			return channel, nil
 		}
 	}
-	// return the last channel if no channel is found
-	return channels[endIdx-1], nil
+	// return null if no channel is not found
+	return nil, errors.New("channel not found")
 }
 
 func CacheGetChannel(id int) (*Channel, error) {