diff --git a/src/models/ActivityUser.ts b/src/models/ActivityUser.ts
index eddbe5b..4d1f2a5 100644
--- a/src/models/ActivityUser.ts
+++ b/src/models/ActivityUser.ts
@@ -46,7 +46,7 @@ export class TaskStatus {
 export interface ActivityUserClass extends Base, TimeStamps {}
 @dbconn()
 @index({ address: 1, activity: 1 }, { unique: true })
-@index({ inviteCode: 1, activity: 1 }, { unique: true })
+@index({ inviteCode: 1, activity: 1 }, { unique: true, partialFilterExpression: { inviteCode: { $exists: true } } })
 @index({ inviteUser: 1, activity: 1 }, { unique: false })
 @index({ twitterId: 1 }, { unique: true, partialFilterExpression: { twitterId: { $exists: true } } })
 @index({ discordId: 1 }, { unique: true, partialFilterExpression: { discordId: { $exists: true } } })
diff --git a/src/services/game.svr.ts b/src/services/game.svr.ts
index edad4aa..7ec007b 100644
--- a/src/services/game.svr.ts
+++ b/src/services/game.svr.ts
@@ -27,7 +27,7 @@ const generateBounsCfg = (cfg: any) => {
   let ys = []
   randoms.forEach((r: number) => {
     let tmp = cfg.maxBounsScore * r
-    tmp = Math.min(1, Math.round(tmp))
+    tmp = Math.max(1, Math.round(tmp))
     ys.push(tmp)
   })
   ys.sort((a: number, b: number) => b - a)