diff --git a/controllers/knowledge_upload_controller.go b/controllers/knowledge_upload_controller.go
index 142d00263..37947d632 100644
--- a/controllers/knowledge_upload_controller.go
+++ b/controllers/knowledge_upload_controller.go
@@ -15,16 +15,22 @@ type KnowUploadController struct {
 func (c *KnowUploadController) SnsUploadImg() {
 	callResult := &CallResult{}
 	var files []*multipart.FileHeader
-	if len(c.Ctx.Request.MultipartForm.File) > 0 {
-		files = c.Ctx.Request.MultipartForm.File["userfiles"]
+	if c.Ctx.Request.MultipartForm != nil {
+		if c.Ctx.Request.MultipartForm.File != nil {
+			if len(c.Ctx.Request.MultipartForm.File) > 0 {
+				files = c.Ctx.Request.MultipartForm.File["userfiles"]
+			}
+		}
 	}
 	isThumb, _ := c.GetBool("isThumb")
 	callResult.Code = model.ErrCodeGeneralFailed
 	callResult.Desc = "请上传正确文件！"
-	if retVal, err := knowledge.SNSUploadImg(nil, files, isThumb); err == nil {
-		data, _ := json.Marshal(retVal)
-		callResult.Data = string(data)
-		callResult.Code = model.ErrCodeSuccess
+	if len(files) > 0 {
+		if retVal, err := knowledge.SNSUploadImg(nil, files, isThumb); err == nil {
+			data, _ := json.Marshal(retVal)
+			callResult.Data = string(data)
+			callResult.Code = model.ErrCodeSuccess
+		}
 	}
 	c.Data["json"] = callResult
 	c.ServeJSON()