diff --git a/pkg/morph/client/balance/wrapper/wrapper.go b/pkg/morph/client/balance/wrapper/wrapper.go
index 41dccf2e1..7afbc68f4 100644
--- a/pkg/morph/client/balance/wrapper/wrapper.go
+++ b/pkg/morph/client/balance/wrapper/wrapper.go
@@ -1,7 +1,6 @@
 package wrapper
 
 import (
-	"errors"
 	"fmt"
 
 	"github.com/nspcc-dev/neo-go/pkg/encoding/fixedn"
@@ -10,12 +9,6 @@ import (
 	"github.com/nspcc-dev/neofs-node/pkg/morph/client/balance"
 )
 
-// Client represents the Balance contract client.
-//
-// It is a type alias of
-// github.com/nspcc-dev/neofs-node/pkg/morph/client/balance.Client.
-type Client = balance.Client
-
 // Wrapper is a wrapper over balance contract
 // client which implements:
 //  * tool for obtaining the amount of funds in the client's account;
@@ -26,13 +19,9 @@ type Client = balance.Client
 // expression (or just declaring a Wrapper variable) is unsafe
 // and can lead to panic.
 type Wrapper struct {
-	client *Client
+	client *balance.Client
 }
 
-// ErrNilWrapper is returned by functions that expect
-// a non-nil Wrapper pointer, but received nil.
-var ErrNilWrapper = errors.New("balance contract client wrapper is nil")
-
 // NewFromMorph returns the wrapper instance from the raw morph client.
 func NewFromMorph(cli *client.Client, contract util.Uint160, fee fixedn.Fixed8) (*Wrapper, error) {
 	staticClient, err := client.NewStatic(cli, contract, fee)
diff --git a/pkg/morph/client/container/wrapper/wrapper.go b/pkg/morph/client/container/wrapper/wrapper.go
index 7635cea5c..32ff7e1e9 100644
--- a/pkg/morph/client/container/wrapper/wrapper.go
+++ b/pkg/morph/client/container/wrapper/wrapper.go
@@ -9,12 +9,6 @@ import (
 	"github.com/nspcc-dev/neofs-node/pkg/morph/client/container"
 )
 
-// Client represents the Container contract client.
-//
-// It is a type alias of
-// github.com/nspcc-dev/neofs-node/pkg/morph/client/container.Client.
-type Client = container.Client
-
 // Wrapper is a wrapper over container contract
 // client which implements container storage and
 // eACL storage methods.
@@ -24,7 +18,7 @@ type Client = container.Client
 // expression (or just declaring a Wrapper variable) is unsafe
 // and can lead to panic.
 type Wrapper struct {
-	client *Client
+	client *container.Client
 }
 
 // NewFromMorph returns the wrapper instance from the raw morph client.
diff --git a/pkg/morph/client/netmap/wrapper/wrapper.go b/pkg/morph/client/netmap/wrapper/wrapper.go
index 0bfc47c72..9310eeb17 100644
--- a/pkg/morph/client/netmap/wrapper/wrapper.go
+++ b/pkg/morph/client/netmap/wrapper/wrapper.go
@@ -1,7 +1,6 @@
 package wrapper
 
 import (
-	"errors"
 	"fmt"
 
 	"github.com/nspcc-dev/neo-go/pkg/encoding/fixedn"
@@ -10,12 +9,6 @@ import (
 	"github.com/nspcc-dev/neofs-node/pkg/morph/client/netmap"
 )
 
-// Client represents the Netmap contract client.
-//
-// It is a type alias of
-// github.com/nspcc-dev/neofs-node/pkg/morph/client/netmap.Client.
-type Client = netmap.Client
-
 // Wrapper is a wrapper over netmap contract
 // client which implements:
 //  * network map storage;
@@ -26,13 +19,9 @@ type Client = netmap.Client
 // expression (or just declaring a Wrapper variable) is unsafe
 // and can lead to panic.
 type Wrapper struct {
-	client *Client
+	client *netmap.Client
 }
 
-// ErrNilWrapper is returned by functions that expect
-// a non-nil Wrapper pointer, but received nil.
-var ErrNilWrapper = errors.New("netmap contract client wrapper is nil")
-
 // NewFromMorph returns the wrapper instance from the raw morph client.
 func NewFromMorph(cli *client.Client, contract util.Uint160, fee fixedn.Fixed8) (*Wrapper, error) {
 	staticClient, err := client.NewStatic(cli, contract, fee)