diff --git a/CHANGELOG.md b/CHANGELOG.md
index d999ef21db13..cc9a32b78b5a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,6 +41,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Improvements
 
 * [\#10262](https://github.com/cosmos/cosmos-sdk/pull/10262) Remove unnecessary logging in `x/feegrant` simulation.
+* [\#10327](https://github.com/cosmos/cosmos-sdk/pull/10327) Add null guard for possible nil `Amount` in tx fee `Coins`
 
 ### Bug Fixes
 
diff --git a/types/coin.go b/types/coin.go
index f6627c4c3a81..fd81cb58203a 100644
--- a/types/coin.go
+++ b/types/coin.go
@@ -181,7 +181,7 @@ func (coin Coin) IsNegative() bool {
 
 // IsNil returns true if the coin amount is nil and false otherwise.
 func (coin Coin) IsNil() bool {
-	return coin.Amount.BigInt() == nil
+	return coin.Amount.i == nil
 }
 
 //-----------------------------------------------------------------------------
diff --git a/types/coin_test.go b/types/coin_test.go
index 0c746ffb6206..2f9873ab42a8 100644
--- a/types/coin_test.go
+++ b/types/coin_test.go
@@ -1319,6 +1319,7 @@ func (s *coinTestSuite) TestCoinsIsAnyNil() {
 	s.Require().True(sdk.Coins{twoAtom, nilAtom, fiveAtom, threeEth}.IsAnyNil())
 	s.Require().True(sdk.Coins{nilAtom, twoAtom, fiveAtom, threeEth}.IsAnyNil())
 	s.Require().False(sdk.Coins{twoAtom, fiveAtom, threeEth}.IsAnyNil())
+
 }
 
 func (s *coinTestSuite) TestMarshalJSONCoins() {
diff --git a/types/tx/types.go b/types/tx/types.go
index b8a61946538c..ac2f01e404ca 100644
--- a/types/tx/types.go
+++ b/types/tx/types.go
@@ -66,7 +66,7 @@ func (t *Tx) ValidateBasic() error {
 	}
 
 	if fee.Amount.IsAnyNil() {
-		return errorsmod.Wrapf(
+		return sdkerrors.Wrapf(
 			sdkerrors.ErrInsufficientFee,
 			"invalid fee provided: null",
 		)