diff --git a/example/set-data-on-message/main.go b/example/set-data-on-message/main.go
index b1afcdf..00a5048 100644
--- a/example/set-data-on-message/main.go
+++ b/example/set-data-on-message/main.go
@@ -14,7 +14,9 @@ import (
 func main() {
 	{
 		msg := &elizav1.SayResponse{}
-		fauxrpc.SetDataOnMessage(msg)
+		if err := fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{}); err != nil {
+			log.Fatalf("err: %s", err)
+		}
 		b, err := protojson.MarshalOptions{Indent: "  "}.Marshal(msg)
 		if err != nil {
 			log.Fatalf("err: %s", err)
@@ -24,7 +26,9 @@ func main() {
 
 	{
 		msg := &ownerv1.Owner{}
-		fauxrpc.SetDataOnMessage(msg)
+		if err := fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{}); err != nil {
+			log.Fatalf("err: %s", err)
+		}
 		b, err := protojson.MarshalOptions{Indent: "  "}.Marshal(msg)
 		if err != nil {
 			log.Fatalf("err: %s", err)
@@ -34,7 +38,9 @@ func main() {
 
 	{
 		msg := &runtimeapi.ListMetricDescriptorsResponse{}
-		fauxrpc.SetDataOnMessage(msg)
+		if err := fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{}); err != nil {
+			log.Fatalf("err: %s", err)
+		}
 		b, err := protojson.MarshalOptions{Indent: "  "}.Marshal(msg)
 		if err != nil {
 			log.Fatalf("err: %s", err)
diff --git a/fauxplugin/handlers.go b/fauxplugin/handlers.go
index cb00cca..9fdf50c 100644
--- a/fauxplugin/handlers.go
+++ b/fauxplugin/handlers.go
@@ -10,7 +10,7 @@ import (
 )
 
 func UnaryHandler[T *proto.Message](ctx context.Context, opts fauxrpc.GenOptions, msg *T) (*connect.Response[T], error) {
-	fauxrpc.SetDataOnMessage(**msg, opts)
+	_ = fauxrpc.SetDataOnMessage(**msg, opts)
 	return connect.NewResponse(msg), nil
 }
 
@@ -26,7 +26,7 @@ func BidiStreamHandler[I proto.Message, O proto.Message](ctx context.Context, st
 	})
 	eg.Go(func() error {
 		var msg O
-		fauxrpc.SetDataOnMessage(msg, opts)
+		_ = fauxrpc.SetDataOnMessage(msg, opts)
 		return stream.Send(&msg)
 	})
 	return eg.Wait()
diff --git a/gen_fields.go b/gen_fields.go
index aca65bb..6624444 100644
--- a/gen_fields.go
+++ b/gen_fields.go
@@ -98,12 +98,12 @@ func getFieldValue(fd protoreflect.FieldDescriptor, opts GenOptions) *protorefle
 		}
 
 		nested := newMessage(fd.Message())
-		setDataOnMessage(nested.Interface(), opts.nested())
+		_ = setDataOnMessage(nested.Interface(), opts.nested())
 		v := protoreflect.ValueOf(nested)
 		return &v
 	case protoreflect.GroupKind:
 		nested := newMessage(fd.Message())
-		setDataOnMessage(nested.Interface(), opts.nested())
+		_ = setDataOnMessage(nested.Interface(), opts.nested())
 		v := protoreflect.ValueOf(nested)
 		return &v
 	}
diff --git a/gen_msg_test.go b/gen_msg_test.go
index c2c05c5..efcaad4 100644
--- a/gen_msg_test.go
+++ b/gen_msg_test.go
@@ -2,6 +2,7 @@ package fauxrpc_test
 
 import (
 	"fmt"
+	"log"
 	"testing"
 
 	elizav1 "buf.build/gen/go/connectrpc/eliza/protocolbuffers/go/connectrpc/eliza/v1"
@@ -19,7 +20,9 @@ var AllTypes = testv1.File_test_v1_test_proto.Messages().ByName("AllTypes")
 
 func ExampleSetDataOnMessage() {
 	msg := &elizav1.SayResponse{}
-	fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{})
+	if err := fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{}); err != nil {
+		log.Fatalf("error: %s", err) // handle error
+	}
 	b, _ := protojson.MarshalOptions{Indent: "  "}.Marshal(msg)
 	fmt.Println(string(b))
 }
@@ -46,7 +49,7 @@ func TestNewMessage(t *testing.T) {
 	t.Run("AllTypes - dynamicpb", func(t *testing.T) {
 		md := testv1.File_test_v1_test_proto.Messages().ByName("AllTypes")
 		msg := dynamicpb.NewMessage(md)
-		fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{})
+		require.NoError(t, fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{}))
 		assertFieldIsSet(t, md, msg, "doubleValue")
 		assertFieldIsSet(t, md, msg, "doubleValue")
 		assertFieldIsSet(t, md, msg, "floatValue")
@@ -83,7 +86,7 @@ func TestNewMessage(t *testing.T) {
 
 	t.Run("AllTypes - concrete", func(t *testing.T) {
 		msg := &testv1.AllTypes{}
-		fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{})
+		require.NoError(t, fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{}))
 		md := msg.ProtoReflect().Descriptor()
 		pmsg := msg.ProtoReflect()
 		assertFieldIsSet(t, md, pmsg, "doubleValue")
@@ -123,7 +126,7 @@ func TestNewMessage(t *testing.T) {
 	t.Run("ParameterValues - dynamicpb", func(t *testing.T) {
 		md := testv1.File_test_v1_test_proto.Messages().ByName("ParameterValues")
 		msg := dynamicpb.NewMessage(md)
-		fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{})
+		require.NoError(t, fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{}))
 		assertFieldIsSet(t, md, msg, "doubleValue")
 		assertFieldIsSet(t, md, msg, "floatValue")
 		assertFieldIsSet(t, md, msg, "int32Value")
@@ -156,7 +159,7 @@ func TestNewMessage(t *testing.T) {
 
 	t.Run("ParameterValues - concrete", func(t *testing.T) {
 		msg := &testv1.ParameterValues{}
-		fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{})
+		require.NoError(t, fauxrpc.SetDataOnMessage(msg, fauxrpc.GenOptions{}))
 		md := msg.ProtoReflect().Descriptor()
 		pmsg := msg.ProtoReflect()
 		assertFieldIsSet(t, md, pmsg, "doubleValue")