diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95e7746c8e..f2e3505985 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -103,6 +103,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (global) [\#694](https://github.com/line/lbm-sdk/pull/694) replace deprecated functions since go 1.16 or 1.17
 * (x/bankplus) [\#705](https://github.com/line/lbm-sdk/pull/705) add missing blockedAddr checking in bankplus
 * (x/foundation) [\#712](https://github.com/line/lbm-sdk/pull/712) fix x/foundation EndBlocker
+* (x/staking) [\#726](https://github.com/line/lbm-sdk/pull/726) check allowedList size in StakeAuthorization.Accept()
 
 ### Breaking Changes
 * (proto) [\#564](https://github.com/line/lbm-sdk/pull/564) change gRPC path to original cosmos path
diff --git a/x/staking/types/authz.go b/x/staking/types/authz.go
index 0771786db5..8d694064a8 100644
--- a/x/staking/types/authz.go
+++ b/x/staking/types/authz.go
@@ -94,7 +94,7 @@ func (a StakeAuthorization) Accept(ctx sdk.Context, msg sdk.Msg) (authz.AcceptRe
 		}
 	}
 
-	if !isValidatorExists {
+	if len(allowedList) > 0 && !isValidatorExists {
 		return authz.AcceptResponse{}, sdkerrors.ErrUnauthorized.Wrapf("cannot delegate/undelegate to %s validator", validatorAddress)
 	}
 
diff --git a/x/staking/types/authz_test.go b/x/staking/types/authz_test.go
index d425dc358d..87a98a2bae 100644
--- a/x/staking/types/authz_test.go
+++ b/x/staking/types/authz_test.go
@@ -121,7 +121,20 @@ func TestAuthzAuthorizations(t *testing.T) {
 			false,
 			nil,
 		},
-
+		{
+			"delegate: testing with a validator out of denylist",
+			[]sdk.ValAddress{},
+			[]sdk.ValAddress{val1},
+			stakingtypes.AuthorizationType_AUTHORIZATION_TYPE_DELEGATE,
+			nil,
+			stakingtypes.NewMsgDelegate(delAddr, val2, coin100),
+			false,
+			false,
+			&stakingtypes.StakeAuthorization{
+				Validators: &stakingtypes.StakeAuthorization_DenyList{
+					DenyList: &stakingtypes.StakeAuthorization_Validators{Address: []string{val1.String()}},
+				}, MaxTokens: nil, AuthorizationType: stakingtypes.AuthorizationType_AUTHORIZATION_TYPE_DELEGATE},
+		},
 		{
 			"undelegate: expect 0 remaining coins",
 			[]sdk.ValAddress{val1, val2},