diff --git a/pallet/staking/src/lib.rs b/pallet/staking/src/lib.rs
index 4db5e2249..85416bdaf 100644
--- a/pallet/staking/src/lib.rs
+++ b/pallet/staking/src/lib.rs
@@ -132,7 +132,12 @@ pub mod pallet {
 		/// A payout has been made for the staker.
 		Payout {
 			staker: T::AccountId,
-			ring_amount: Balance,
+			amount: Balance,
+		},
+		/// Unable to pay the staker's reward.
+		Unpaied {
+			staker: T::AccountId,
+			amount: Balance,
 		},
 		/// A new collator set has been elected.
 		Elected {
@@ -814,7 +819,12 @@ pub mod pallet {
 
 						Self::deposit_event(Event::Payout {
 							staker: n_exposure.who,
-							ring_amount: n_payout,
+							amount: n_payout,
+						});
+					} else {
+						Self::deposit_event(Event::Unpaied {
+							staker: n_exposure.who,
+							amount: n_payout,
 						});
 					}
 				}
@@ -822,7 +832,9 @@ pub mod pallet {
 				if T::OnSessionEnd::reward(&c, c_payout).is_ok() {
 					actual_payout += c_payout;
 
-					Self::deposit_event(Event::Payout { staker: c, ring_amount: c_payout });
+					Self::deposit_event(Event::Payout { staker: c, amount: c_payout });
+				} else {
+					Self::deposit_event(Event::Unpaied { staker: c, amount: c_payout });
 				}
 			}
 
diff --git a/runtime/crab/src/pallets/staking.rs b/runtime/crab/src/pallets/staking.rs
index 1a208a7fb..7fafe2ffc 100644
--- a/runtime/crab/src/pallets/staking.rs
+++ b/runtime/crab/src/pallets/staking.rs
@@ -79,17 +79,12 @@ impl darwinia_staking::OnSessionEnd<Runtime> for OnCrabSessionEnd {
 	}
 
 	fn reward(who: &AccountId, amount: Balance) -> sp_runtime::DispatchResult {
-		if let Err(e) = <Balances as Currency<AccountId>>::transfer(
+		<Balances as Currency<AccountId>>::transfer(
 			&Treasury::account_id(),
 			who,
 			amount,
 			frame_support::traits::ExistenceRequirement::KeepAlive,
-		) {
-			// TODO: log
-			// log::error!("[runtime::staking] reward error: {:?}", e);
-		}
-
-		Ok(())
+		)
 	}
 }
 
diff --git a/runtime/darwinia/src/pallets/staking.rs b/runtime/darwinia/src/pallets/staking.rs
index 288b87444..9e2398355 100644
--- a/runtime/darwinia/src/pallets/staking.rs
+++ b/runtime/darwinia/src/pallets/staking.rs
@@ -95,10 +95,7 @@ impl darwinia_staking::OnSessionEnd<Runtime> for OnDarwiniaSessionEnd {
 	}
 
 	fn reward(who: &AccountId, amount: Balance) -> sp_runtime::DispatchResult {
-		if let Err(e) = Balances::deposit_into_existing(who, amount) {
-			// TODO: log
-			// log::error!("[runtime::staking] reward error: {:?}", e);
-		}
+		let _ = Balances::deposit_into_existing(who, amount)?;
 
 		Ok(())
 	}
diff --git a/runtime/pangolin/src/pallets/staking.rs b/runtime/pangolin/src/pallets/staking.rs
index c32927151..fe78c2833 100644
--- a/runtime/pangolin/src/pallets/staking.rs
+++ b/runtime/pangolin/src/pallets/staking.rs
@@ -73,17 +73,12 @@ impl darwinia_staking::OnSessionEnd<Runtime> for OnPangolinSessionEnd {
 	}
 
 	fn reward(who: &AccountId, amount: Balance) -> sp_runtime::DispatchResult {
-		if let Err(e) = <Balances as frame_support::traits::Currency<AccountId>>::transfer(
+		<Balances as frame_support::traits::Currency<AccountId>>::transfer(
 			&Treasury::account_id(),
 			who,
 			amount,
 			frame_support::traits::ExistenceRequirement::KeepAlive,
-		) {
-			// TODO: log
-			// log::error!("[runtime::staking] reward error: {:?}", e);
-		}
-
-		Ok(())
+		)
 	}
 }
 
diff --git a/runtime/pangoro/src/pallets/staking.rs b/runtime/pangoro/src/pallets/staking.rs
index 80ac35445..8deddfaa9 100644
--- a/runtime/pangoro/src/pallets/staking.rs
+++ b/runtime/pangoro/src/pallets/staking.rs
@@ -91,10 +91,7 @@ impl darwinia_staking::OnSessionEnd<Runtime> for OnPangoroSessionEnd {
 	}
 
 	fn reward(who: &AccountId, amount: Balance) -> sp_runtime::DispatchResult {
-		if let Err(e) = Balances::deposit_into_existing(who, amount) {
-			// TODO: log
-			// log::error!("[runtime::staking] reward error: {:?}", e);
-		}
+		let _ = Balances::deposit_into_existing(who, amount)?;
 
 		Ok(())
 	}