diff --git a/pkg/morph/client/client.go b/pkg/morph/client/client.go
index 1c12130b7..aab058d27 100644
--- a/pkg/morph/client/client.go
+++ b/pkg/morph/client/client.go
@@ -151,20 +151,6 @@ func (e *notHaltStateError) Error() string {
 	)
 }
 
-// implementation of error interface for FrostFS-specific errors.
-type frostfsError struct {
-	err error
-}
-
-func (e frostfsError) Error() string {
-	return fmt.Sprintf("frostfs error: %v", e.err)
-}
-
-// wraps FrostFS-specific error into frostfsError. Arg must not be nil.
-func wrapFrostFSError(err error) error {
-	return frostfsError{err}
-}
-
 // Invoke invokes contract method by sending transaction into blockchain.
 // Returns valid until block value.
 // Supported args types: int64, string, util.Uint160, []byte and bool.
@@ -228,7 +214,7 @@ func (c *Client) TestInvokeIterator(cb func(stackitem.Item) error, batchSize int
 	if err != nil {
 		return err
 	} else if val.State != HaltState {
-		return wrapFrostFSError(&notHaltStateError{state: val.State, exception: val.FaultException})
+		return &notHaltStateError{state: val.State, exception: val.FaultException}
 	}
 
 	arr, sid, r, err := unwrap.ArrayAndSessionIterator(val, err)
@@ -292,7 +278,7 @@ func (c *Client) TestInvoke(contract util.Uint160, method string, args ...any) (
 	}
 
 	if val.State != HaltState {
-		return nil, wrapFrostFSError(&notHaltStateError{state: val.State, exception: val.FaultException})
+		return nil, &notHaltStateError{state: val.State, exception: val.FaultException}
 	}
 
 	success = true
diff --git a/pkg/morph/client/notary.go b/pkg/morph/client/notary.go
index 4e20a3639..448702613 100644
--- a/pkg/morph/client/notary.go
+++ b/pkg/morph/client/notary.go
@@ -461,7 +461,7 @@ func (c *Client) notaryInvoke(ctx context.Context, committee, invokedByAlpha boo
 
 	mainH, fbH, untilActual, err := nAct.Notarize(nAct.MakeTunedCall(contract, method, nil, func(r *result.Invoke, t *transaction.Transaction) error {
 		if r.State != vmstate.Halt.String() {
-			return wrapFrostFSError(&notHaltStateError{state: r.State, exception: r.FaultException})
+			return &notHaltStateError{state: r.State, exception: r.FaultException}
 		}
 
 		t.ValidUntilBlock = until
@@ -608,8 +608,7 @@ func (c *Client) notaryMultisigAccount(ir []*keys.PublicKey, committee, invokedB
 		multisigAccount = wallet.NewAccountFromPrivateKey(c.acc.PrivateKey())
 		err := multisigAccount.ConvertMultisig(m, ir)
 		if err != nil {
-			// wrap error as FrostFS-specific since the call is not related to any client
-			return nil, wrapFrostFSError(fmt.Errorf("convert account to inner ring multisig wallet: %w", err))
+			return nil, fmt.Errorf("convert account to inner ring multisig wallet: %w", err)
 		}
 	} else {
 		// alphabet multisig redeem script is
@@ -617,8 +616,7 @@ func (c *Client) notaryMultisigAccount(ir []*keys.PublicKey, committee, invokedB
 		// inner ring multiaddress witness
 		multisigAccount, err = notary.FakeMultisigAccount(m, ir)
 		if err != nil {
-			// wrap error as FrostFS-specific since the call is not related to any client
-			return nil, wrapFrostFSError(fmt.Errorf("make inner ring multisig wallet: %w", err))
+			return nil, fmt.Errorf("make inner ring multisig wallet: %w", err)
 		}
 	}
 
diff --git a/pkg/morph/client/util.go b/pkg/morph/client/util.go
index f68d39beb..f7b6705a8 100644
--- a/pkg/morph/client/util.go
+++ b/pkg/morph/client/util.go
@@ -98,7 +98,7 @@ func StringFromStackItem(param stackitem.Item) (string, error) {
 func addFeeCheckerModifier(add int64) func(r *result.Invoke, t *transaction.Transaction) error {
 	return func(r *result.Invoke, t *transaction.Transaction) error {
 		if r.State != HaltState {
-			return wrapFrostFSError(&notHaltStateError{state: r.State, exception: r.FaultException})
+			return &notHaltStateError{state: r.State, exception: r.FaultException}
 		}
 
 		t.SystemFee += add
diff --git a/pkg/morph/client/waiter.go b/pkg/morph/client/waiter.go
index 5b9d2cbe0..87fcf84b8 100644
--- a/pkg/morph/client/waiter.go
+++ b/pkg/morph/client/waiter.go
@@ -47,5 +47,5 @@ func (c *Client) WaitTxHalt(ctx context.Context, vub uint32, h util.Uint256) err
 	if res.VMState.HasFlag(vmstate.Halt) {
 		return nil
 	}
-	return wrapFrostFSError(&notHaltStateError{state: res.VMState.String(), exception: res.FaultException})
+	return &notHaltStateError{state: res.VMState.String(), exception: res.FaultException}
 }