diff --git a/api/service/Question.go b/api/service/Question.go
index db57570..38deb2e 100644
--- a/api/service/Question.go
+++ b/api/service/Question.go
@@ -489,6 +489,8 @@ func (r *QuestionService) PutQuestion(questionId int64, req requests.PutQuestion
 		}
 
 		questionData["question_image"] = strings.Join(result, ",")
+	} else {
+		questionData["question_image"] = nil
 	}
 
 	// 答案