diff --git a/simapp/test_helpers.go b/simapp/test_helpers.go
index 1e1bd249c116..ff641f2c689d 100644
--- a/simapp/test_helpers.go
+++ b/simapp/test_helpers.go
@@ -5,6 +5,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"math/rand"
 	"strconv"
 	"testing"
 	"time"
@@ -326,6 +327,7 @@ func SignCheckDeliver(
 	chainID string, accNums, accSeqs []uint64, expSimPass, expPass bool, priv ...cryptotypes.PrivKey,
 ) (sdk.GasInfo, *sdk.Result, error) {
 	tx, err := helpers.GenTx(
+		rand.New(rand.NewSource(time.Now().UnixNano())),
 		txCfg,
 		msgs,
 		sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 0)},
@@ -376,6 +378,7 @@ func GenSequenceOfTxs(txGen client.TxConfig, msgs []sdk.Msg, accNums []uint64, i
 	var err error
 	for i := 0; i < numToGenerate; i++ {
 		txs[i], err = helpers.GenTx(
+			rand.New(rand.NewSource(time.Now().UnixNano())),
 			txGen,
 			msgs,
 			sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 0)},
diff --git a/x/authz/simulation/operations.go b/x/authz/simulation/operations.go
index 3d57041fed61..44f92a8e87ad 100644
--- a/x/authz/simulation/operations.go
+++ b/x/authz/simulation/operations.go
@@ -117,6 +117,7 @@ func SimulateMsgGrant(ak authz.AccountKeeper, bk authz.BankKeeper, _ keeper.Keep
 		}
 		txCfg := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenTx(
+			r,
 			txCfg,
 			[]sdk.Msg{msg},
 			fees,
@@ -183,6 +184,7 @@ func SimulateMsgRevoke(ak authz.AccountKeeper, bk authz.BankKeeper, k keeper.Kee
 		txCfg := simappparams.MakeTestEncodingConfig().TxConfig
 		account := ak.GetAccount(ctx, granterAddr)
 		tx, err := helpers.GenTx(
+			r,
 			txCfg,
 			[]sdk.Msg{&msg},
 			fees,
@@ -241,6 +243,10 @@ func SimulateMsgExec(ak authz.AccountKeeper, bk authz.BankKeeper, k keeper.Keepe
 
 		granterspendableCoins := bk.SpendableCoins(ctx, granterAddr)
 		coins := simtypes.RandSubsetCoins(r, granterspendableCoins)
+		// if coins slice is empty, we can not create valid banktype.MsgSend
+		if len(coins) == 0 {
+			return simtypes.NoOpMsg(authz.ModuleName, TypeMsgExec, "empty coins slice"), nil, nil
+		}
 		// Check send_enabled status of each sent coin denom
 		if err := bk.IsSendEnabledCoins(ctx, coins...); err != nil {
 			return simtypes.NoOpMsg(authz.ModuleName, TypeMsgExec, err.Error()), nil, nil
@@ -273,6 +279,7 @@ func SimulateMsgExec(ak authz.AccountKeeper, bk authz.BankKeeper, k keeper.Keepe
 		txCfg := simappparams.MakeTestEncodingConfig().TxConfig
 		granteeAcc := ak.GetAccount(ctx, granteeAddr)
 		tx, err := helpers.GenTx(
+			r,
 			txCfg,
 			[]sdk.Msg{&msgExec},
 			fees,
diff --git a/x/bank/simulation/operations.go b/x/bank/simulation/operations.go
index aa12c0e0478a..b354fbfe9dfb 100644
--- a/x/bank/simulation/operations.go
+++ b/x/bank/simulation/operations.go
@@ -59,6 +59,10 @@ func SimulateMsgSend(ak types.AccountKeeper, bk keeper.Keeper) simtypes.Operatio
 		accs []simtypes.Account, chainID string,
 	) (simtypes.OperationMsg, []simtypes.FutureOperation, error) {
 		from, to, coins, skip := randomSendFields(r, ctx, accs, bk, ak)
+		// if coins slice is empty, we can not create valid types.MsgSend
+		if len(coins) == 0 {
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgSend, "empty coins slice"), nil, nil
+		}
 
 		// Check send_enabled status of each coin denom
 		if err := bk.IsSendEnabledCoins(ctx, coins...); err != nil {
@@ -93,6 +97,10 @@ func SimulateMsgSendToModuleAccount(ak types.AccountKeeper, bk keeper.Keeper, mo
 
 		spendable := bk.SpendableCoins(ctx, from.Address)
 		coins := simtypes.RandSubsetCoins(r, spendable)
+		// if coins slice is empty, we can not create valid types.MsgSend
+		if len(coins) == 0 {
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgSend, "empty coins slice"), nil, nil
+		}
 
 		// Check send_enabled status of each coin denom
 		if err := bk.IsSendEnabledCoins(ctx, coins...); err != nil {
@@ -137,6 +145,7 @@ func sendMsgSend(
 	}
 	txGen := simappparams.MakeTestEncodingConfig().TxConfig
 	tx, err := helpers.GenTx(
+		r,
 		txGen,
 		[]sdk.Msg{msg},
 		fees,
@@ -350,6 +359,7 @@ func sendMsgMultiSend(
 
 	txGen := simappparams.MakeTestEncodingConfig().TxConfig
 	tx, err := helpers.GenTx(
+		r,
 		txGen,
 		[]sdk.Msg{msg},
 		fees,
diff --git a/x/distribution/simulation/operations.go b/x/distribution/simulation/operations.go
index 89a667777f50..9d898d07f9c1 100644
--- a/x/distribution/simulation/operations.go
+++ b/x/distribution/simulation/operations.go
@@ -229,6 +229,7 @@ func SimulateMsgFundCommunityPool(ak types.AccountKeeper, bk types.BankKeeper, k
 		msg := types.NewMsgFundCommunityPool(fundAmount, funder.Address)
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         simappparams.MakeTestEncodingConfig().TxConfig,
 			Cdc:           nil,
diff --git a/x/genutil/gentx_test.go b/x/genutil/gentx_test.go
index a6e636f84f1c..bf0a6ff7c07f 100644
--- a/x/genutil/gentx_test.go
+++ b/x/genutil/gentx_test.go
@@ -3,7 +3,9 @@ package genutil_test
 import (
 	"encoding/json"
 	"fmt"
+	"math/rand"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/suite"
 	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
@@ -233,6 +235,7 @@ func (suite *GenTxTestSuite) TestDeliverGenTxs() {
 
 				msg := banktypes.NewMsgSend(addr1, addr2, sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 1)})
 				tx, err := helpers.GenTx(
+					rand.New(rand.NewSource(time.Now().UnixNano())),
 					suite.encodingConfig.TxConfig,
 					[]sdk.Msg{msg},
 					sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 10)},
diff --git a/x/gov/simulation/operations.go b/x/gov/simulation/operations.go
index 25fc6d9b811a..d8aecd1e32fd 100644
--- a/x/gov/simulation/operations.go
+++ b/x/gov/simulation/operations.go
@@ -155,6 +155,7 @@ func SimulateMsgSubmitProposal(
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
@@ -241,6 +242,7 @@ func SimulateMsgDeposit(ak types.AccountKeeper, bk types.BankKeeper, k keeper.Ke
 		}
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         simappparams.MakeTestEncodingConfig().TxConfig,
 			Cdc:           nil,
diff --git a/x/simulation/util.go b/x/simulation/util.go
index beeb009d02b3..9ca1205411cf 100644
--- a/x/simulation/util.go
+++ b/x/simulation/util.go
@@ -101,6 +101,7 @@ func GenAndDeliverTxWithRandFees(txCtx OperationInput) (simtypes.OperationMsg, [
 func GenAndDeliverTx(txCtx OperationInput, fees sdk.Coins) (simtypes.OperationMsg, []simtypes.FutureOperation, error) {
 	account := txCtx.AccountKeeper.GetAccount(txCtx.Context, txCtx.SimAccount.Address)
 	tx, err := helpers.GenTx(
+		txCtx.R,
 		txCtx.TxGen,
 		[]sdk.Msg{txCtx.Msg},
 		fees,
diff --git a/x/slashing/simulation/operations.go b/x/slashing/simulation/operations.go
index 788ae4f90eb0..a4bfd93d549a 100644
--- a/x/slashing/simulation/operations.go
+++ b/x/slashing/simulation/operations.go
@@ -88,6 +88,7 @@ func SimulateMsgUnjail(ak types.AccountKeeper, bk types.BankKeeper, k keeper.Kee
 
 		txGen := simappparams.MakeTestEncodingConfig().TxConfig
 		tx, err := helpers.GenTx(
+			r,
 			txGen,
 			[]sdk.Msg{msg},
 			fees,
diff --git a/x/staking/simulation/operations.go b/x/staking/simulation/operations.go
index 6bedbb5315b3..2a1c86d635c7 100644
--- a/x/staking/simulation/operations.go
+++ b/x/staking/simulation/operations.go
@@ -152,6 +152,7 @@ func SimulateMsgCreateValidator(ak types.AccountKeeper, bk types.BankKeeper, k k
 		}
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         simappparams.MakeTestEncodingConfig().TxConfig,
 			Cdc:           nil,
@@ -276,6 +277,7 @@ func SimulateMsgDelegate(ak types.AccountKeeper, bk types.BankKeeper, k keeper.K
 		msg := types.NewMsgDelegate(simAccount.Address, val.GetOperator(), bondAmt)
 
 		txCtx := simulation.OperationInput{
+			R:             r,
 			App:           app,
 			TxGen:         simappparams.MakeTestEncodingConfig().TxConfig,
 			Cdc:           nil,