diff --git a/x/tx/CHANGELOG.md b/x/tx/CHANGELOG.md
index 5df0a95715e5..040681ddb96c 100644
--- a/x/tx/CHANGELOG.md
+++ b/x/tx/CHANGELOG.md
@@ -39,6 +39,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * [#19845](https://github.com/cosmos/cosmos-sdk/pull/19845) Use hybrid resolver instead of only protov2 registry
 
+### 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/json_marshal.go b/x/tx/signing/aminojson/json_marshal.go
index efa53882c26b..cdbb9aa2ac21 100644
--- a/x/tx/signing/aminojson/json_marshal.go
+++ b/x/tx/signing/aminojson/json_marshal.go
@@ -164,6 +164,9 @@ 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{}
@@ -171,10 +174,10 @@ 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 {