fix: inner error is nil

report.go

@@ -80,7 +80,7 @@ func (*errValCoder) IsEmpty(ptr unsafe.Pointer) bool {
 
 func (*errValCoder) Encode(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 	val := (*error)(ptr)
-	if val == nil || *val == nil {
+	if val == nil || *val == nil || reflect2.IsNil(*val) {
 		stream.WriteNil()
 		return
 	}

report_test.go

@@ -13,6 +13,9 @@ func TestErrorJSONMarshal(t *testing.T) {
 	m := map[string]error{}
 	m["test"] = syscall.EROFS
 
+	var innerNilErr *Error
+	m["test-nil"] = innerNilErr
+
 	var err error
 	logrus.Infof("get error type %s", spew.Sdump(reflect2.TypeOfPtr(&err).Elem()))