diff --git a/internal/repo/captcha/captcha.go b/internal/repo/captcha/captcha.go
index f8195c1ae..800a0fd1f 100644
--- a/internal/repo/captcha/captcha.go
+++ b/internal/repo/captcha/captcha.go
@@ -53,7 +53,7 @@ func (cr *captchaRepo) SetActionType(ctx context.Context, unit, actionType, conf
 	value.Num = amount
 	valueStr, err := json.Marshal(value)
 	if err != nil {
-		return nil
+		return err
 	}
 	err = cr.data.Cache.SetString(ctx, cacheKey, string(valueStr), 6*time.Minute)
 	if err != nil {
diff --git a/internal/service/content/question_service.go b/internal/service/content/question_service.go
index ced0e0109..c04baa289 100644
--- a/internal/service/content/question_service.go
+++ b/internal/service/content/question_service.go
@@ -1466,7 +1466,7 @@ func canViewSimilarQuestion(question *entity.Question, userID string, per schema
 func (qs *QuestionService) SimilarQuestion(ctx context.Context, questionID string, loginUserID string) ([]*schema.QuestionPageResp, int64, error) {
 	question, err := qs.questioncommon.Info(ctx, questionID, loginUserID)
 	if err != nil {
-		return nil, 0, nil
+		return nil, 0, err
 	}
 	tagNames := make([]string, 0, len(question.Tags))
 	for _, tag := range question.Tags {
diff --git a/internal/service/content/revision_service.go b/internal/service/content/revision_service.go
index b932ba8b7..64e5fe9d1 100644
--- a/internal/service/content/revision_service.go
+++ b/internal/service/content/revision_service.go
@@ -508,7 +508,7 @@ func (rs *RevisionService) CheckCanUpdateRevision(ctx context.Context, req *sche
 	resp *schema.ErrTypeData, err error) {
 	_, exist, err := rs.revisionRepo.ExistUnreviewedByObjectID(ctx, req.ID)
 	if err != nil {
-		return nil, nil
+		return nil, err
 	}
 	if exist {
 		return &schema.ErrTypeToast, errors.BadRequest(reason.RevisionReviewUnderway)