diff --git a/modules/openapi-generator/src/main/resources/go/client.mustache b/modules/openapi-generator/src/main/resources/go/client.mustache
index eeb1197939d8..80fc15bfc2c1 100644
--- a/modules/openapi-generator/src/main/resources/go/client.mustache
+++ b/modules/openapi-generator/src/main/resources/go/client.mustache
@@ -725,16 +725,17 @@ func formatErrorMessage(status string, v interface{}) string {
 	str := ""
 	metaValue := reflect.ValueOf(v).Elem()
 
-	field := metaValue.FieldByName("Title")
-	if field != (reflect.Value{}) {
-		str = fmt.Sprintf("%s", field.Interface())
-	}
+	if metaValue.Kind() == reflect.Struct {
+		field := metaValue.FieldByName("Title")
+		if field != (reflect.Value{}) {
+			str = fmt.Sprintf("%s", field.Interface())
+		}
 
-	field = metaValue.FieldByName("Detail")
-	if field != (reflect.Value{}) {
-		str = fmt.Sprintf("%s (%s)", str, field.Interface())
+		field = metaValue.FieldByName("Detail")
+		if field != (reflect.Value{}) {
+			str = fmt.Sprintf("%s (%s)", str, field.Interface())
+		}
 	}
 
-	// status title (detail)
 	return strings.TrimSpace(fmt.Sprintf("%s %s", status, str))
 }
diff --git a/samples/client/petstore/go/go-petstore/client.go b/samples/client/petstore/go/go-petstore/client.go
index bf4e180c44f3..3209cfd0181e 100644
--- a/samples/client/petstore/go/go-petstore/client.go
+++ b/samples/client/petstore/go/go-petstore/client.go
@@ -672,16 +672,17 @@ func formatErrorMessage(status string, v interface{}) string {
 	str := ""
 	metaValue := reflect.ValueOf(v).Elem()
 
-	field := metaValue.FieldByName("Title")
-	if field != (reflect.Value{}) {
-		str = fmt.Sprintf("%s", field.Interface())
-	}
+	if metaValue.Kind() == reflect.Struct {
+		field := metaValue.FieldByName("Title")
+		if field != (reflect.Value{}) {
+			str = fmt.Sprintf("%s", field.Interface())
+		}
 
-	field = metaValue.FieldByName("Detail")
-	if field != (reflect.Value{}) {
-		str = fmt.Sprintf("%s (%s)", str, field.Interface())
+		field = metaValue.FieldByName("Detail")
+		if field != (reflect.Value{}) {
+			str = fmt.Sprintf("%s (%s)", str, field.Interface())
+		}
 	}
 
-	// status title (detail)
 	return strings.TrimSpace(fmt.Sprintf("%s %s", status, str))
 }
diff --git a/samples/openapi3/client/extensions/x-auth-id-alias/go-experimental/client.go b/samples/openapi3/client/extensions/x-auth-id-alias/go-experimental/client.go
index ed42e1f1b88e..1b13ffceee0e 100644
--- a/samples/openapi3/client/extensions/x-auth-id-alias/go-experimental/client.go
+++ b/samples/openapi3/client/extensions/x-auth-id-alias/go-experimental/client.go
@@ -640,16 +640,17 @@ func formatErrorMessage(status string, v interface{}) string {
 	str := ""
 	metaValue := reflect.ValueOf(v).Elem()
 
-	field := metaValue.FieldByName("Title")
-	if field != (reflect.Value{}) {
-		str = fmt.Sprintf("%s", field.Interface())
-	}
+	if metaValue.Kind() == reflect.Struct {
+		field := metaValue.FieldByName("Title")
+		if field != (reflect.Value{}) {
+			str = fmt.Sprintf("%s", field.Interface())
+		}
 
-	field = metaValue.FieldByName("Detail")
-	if field != (reflect.Value{}) {
-		str = fmt.Sprintf("%s (%s)", str, field.Interface())
+		field = metaValue.FieldByName("Detail")
+		if field != (reflect.Value{}) {
+			str = fmt.Sprintf("%s (%s)", str, field.Interface())
+		}
 	}
 
-	// status title (detail)
 	return strings.TrimSpace(fmt.Sprintf("%s %s", status, str))
 }
diff --git a/samples/openapi3/client/petstore/go/go-petstore/client.go b/samples/openapi3/client/petstore/go/go-petstore/client.go
index 77a8b5f03860..3df7e6b46e85 100644
--- a/samples/openapi3/client/petstore/go/go-petstore/client.go
+++ b/samples/openapi3/client/petstore/go/go-petstore/client.go
@@ -690,16 +690,17 @@ func formatErrorMessage(status string, v interface{}) string {
 	str := ""
 	metaValue := reflect.ValueOf(v).Elem()
 
-	field := metaValue.FieldByName("Title")
-	if field != (reflect.Value{}) {
-		str = fmt.Sprintf("%s", field.Interface())
-	}
+	if metaValue.Kind() == reflect.Struct {
+		field := metaValue.FieldByName("Title")
+		if field != (reflect.Value{}) {
+			str = fmt.Sprintf("%s", field.Interface())
+		}
 
-	field = metaValue.FieldByName("Detail")
-	if field != (reflect.Value{}) {
-		str = fmt.Sprintf("%s (%s)", str, field.Interface())
+		field = metaValue.FieldByName("Detail")
+		if field != (reflect.Value{}) {
+			str = fmt.Sprintf("%s (%s)", str, field.Interface())
+		}
 	}
 
-	// status title (detail)
 	return strings.TrimSpace(fmt.Sprintf("%s %s", status, str))
 }