diff --git a/changes/ana_polkadot-rewards-amounts-as-bignumber-and-enable b/changes/ana_polkadot-rewards-amounts-as-bignumber-and-enable
new file mode 100644
index 0000000000..f97b0d2be4
--- /dev/null
+++ b/changes/ana_polkadot-rewards-amounts-as-bignumber-and-enable
@@ -0,0 +1,2 @@
+[Changed] [#583](https://github.com/cosmos/lunie/pull/583) Polkadot rewards amounts stored in DB have now a fixed number of decimals of 9 @Bitcoinera
+[Fixed] [#583](https://github.com/cosmos/lunie/pull/583) Perhaps fixes storing empty rewards bug ("store rewards 0") @Bitcoinera
\ No newline at end of file
diff --git a/lib/block-listeners/polkadot-node-subscription.js b/lib/block-listeners/polkadot-node-subscription.js
index bc63319b78..7fe0c87a03 100644
--- a/lib/block-listeners/polkadot-node-subscription.js
+++ b/lib/block-listeners/polkadot-node-subscription.js
@@ -222,6 +222,14 @@ class PolkadotNodeSubscription {
   }
   async updateRewards(era, chainId) {
     const rewards = await this.polkadotAPI.getEraRewards(era) // ATTENTION: era means "get all rewards of all eras since that era". putting a low number takes a long time.
+    // perhaps the moment of era change it is still too early to fetch the previous era rewards
+    // we loop waiting for rewards every 10 seconds
+    if (rewards.length === 0) {
+      console.log('Rewards in era are 0, will retry getting rewards in 10s')
+      setTimeout(async () => {
+        await this.updateRewards(era, chainId)
+      }, 10000)
+    }
     console.log('store rewards', rewards.length)
     this.storeRewards(
       rewards
diff --git a/lib/reducers/polkadotV0-reducers.js b/lib/reducers/polkadotV0-reducers.js
index 80c6784121..32f346d97e 100644
--- a/lib/reducers/polkadotV0-reducers.js
+++ b/lib/reducers/polkadotV0-reducers.js
@@ -316,9 +316,10 @@ function rewardsReducer(network, validators, rewards, reducers) {
             JSON.stringify(validatorReward.validator)
       )
       if (existingRewardCollectionForValidator) {
-        existingRewardCollectionForValidator.amount =
+        existingRewardCollectionForValidator.amount = (
           parseFloat(existingRewardCollectionForValidator.amount) +
           parseFloat(validatorReward.amount)
+        ).toFixed(9)
       } else {
         collection.push(validatorReward)
       }