diff --git a/x/tx/CHANGELOG.md b/x/tx/CHANGELOG.md
index 1ddbcc1631b1..eaa2e851e820 100644
--- a/x/tx/CHANGELOG.md
+++ b/x/tx/CHANGELOG.md
@@ -35,6 +35,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * [#276](https://github.com/crypto-org-chain/cosmos-sdk/pull/276) Support bytes in automatic signer getters.
 
+### Bug Fixes
+
+* [#19955](https://github.com/cosmos/cosmos-sdk/pull/19955) Don't shadow Amino marshalling error messages
+
 ## v0.13.1
 
 ### Features
diff --git a/x/tx/signing/aminojson/encoder.go b/x/tx/signing/aminojson/encoder.go
index 07a7c8ea0792..90ac7d5d0167 100644
--- a/x/tx/signing/aminojson/encoder.go
+++ b/x/tx/signing/aminojson/encoder.go
@@ -10,7 +10,6 @@ import (
 	"google.golang.org/protobuf/reflect/protoreflect"
 
 	authapi "cosmossdk.io/api/cosmos/auth/v1beta1"
-	"cosmossdk.io/api/cosmos/crypto/multisig"
 	"cosmossdk.io/math"
 )
 
@@ -143,24 +142,15 @@ func moduleAccountEncoder(_ *Encoder, msg protoreflect.Message, w io.Writer) err
 // also see:
 // https://github.com/cosmos/cosmos-sdk/blob/b49f948b36bc991db5be431607b475633aed697e/proto/cosmos/crypto/multisig/keys.proto#L15/
 func thresholdStringEncoder(enc *Encoder, msg protoreflect.Message, w io.Writer) error {
-	pk, ok := msg.Interface().(*multisig.LegacyAminoPubKey)
-	if !ok {
-		return errors.New("thresholdStringEncoder: msg not a multisig.LegacyAminoPubKey")
-	}
-	_, err := fmt.Fprintf(w, `{"threshold":"%d","pubkeys":`, pk.Threshold)
+	fields := msg.Descriptor().Fields()
+	thresholdField := fields.ByName("threshold")
+	threshold := msg.Get(thresholdField).Uint()
+	_, err := fmt.Fprintf(w, `{"threshold":"%d","pubkeys":`, threshold)
 	if err != nil {
 		return err
 	}
-
-	if len(pk.PublicKeys) == 0 {
-		_, err = io.WriteString(w, `[]}`)
-		return err
-	}
-
-	fields := msg.Descriptor().Fields()
 	pubkeysField := fields.ByName("public_keys")
 	pubkeys := msg.Get(pubkeysField).List()
-
 	err = enc.marshalList(pubkeys, pubkeysField, w)
 	if err != nil {
 		return err
diff --git a/x/tx/signing/aminojson/json_marshal.go b/x/tx/signing/aminojson/json_marshal.go
index 800dfc7fd320..d4d1fc2b1151 100644
--- a/x/tx/signing/aminojson/json_marshal.go
+++ b/x/tx/signing/aminojson/json_marshal.go
@@ -162,6 +162,9 @@ func (enc Encoder) DefineTypeEncoding(typeURL string, encoder MessageEncoder) En
 func (enc Encoder) Marshal(message proto.Message) ([]byte, error) {
 	buf := &bytes.Buffer{}
 	err := enc.beginMarshal(message.ProtoReflect(), buf, false)
+	if err != nil {
+		return nil, err
+	}
 
 	if enc.indent != "" {
 		indentBuf := &bytes.Buffer{}
@@ -169,10 +172,10 @@ func (enc Encoder) Marshal(message proto.Message) ([]byte, error) {
 			return nil, err
 		}
 
-		return indentBuf.Bytes(), err
+		return indentBuf.Bytes(), nil
 	}
 
-	return buf.Bytes(), err
+	return buf.Bytes(), nil
 }
 
 func (enc Encoder) beginMarshal(msg protoreflect.Message, writer io.Writer, isAny bool) error {