diff --git a/src/events/rewards/rewards.service.ts b/src/events/rewards/rewards.service.ts
index e491d07..e547c35 100644
--- a/src/events/rewards/rewards.service.ts
+++ b/src/events/rewards/rewards.service.ts
@@ -79,7 +79,11 @@ export class RewardsService {
         'last rewards was not updated because last TokenRebase events were not found during last 48 hours.',
         { service: 'rewards' },
       );
-      return null;
+      return {
+        clRewards: BigNumber.from(0),
+        elRewards: BigNumber.from(0),
+        allRewards: BigNumber.from(0),
+      };
     }
 
     const { blockNumber, frames } = framesFromLastReport;
diff --git a/src/storage/rewards/rewards.service.ts b/src/storage/rewards/rewards.service.ts
index 3133373..b74f461 100644
--- a/src/storage/rewards/rewards.service.ts
+++ b/src/storage/rewards/rewards.service.ts
@@ -3,9 +3,9 @@ import { BigNumber } from '@ethersproject/bignumber';
 
 @Injectable()
 export class RewardsStorageService {
-  protected rewardsPerFrame: BigNumber;
-  protected clRewardsPerFrame: BigNumber;
-  protected elRewardsPerFrame: BigNumber;
+  protected rewardsPerFrame: BigNumber = BigNumber.from(0);
+  protected clRewardsPerFrame: BigNumber = BigNumber.from(0);
+  protected elRewardsPerFrame: BigNumber = BigNumber.from(0);
 
   public getRewardsPerFrame() {
     return this.rewardsPerFrame;