diff --git a/pkg/internal/server/api/attachment_dir_api.go b/pkg/internal/server/api/attachment_dir_api.go
index aec5767..2ad216b 100644
--- a/pkg/internal/server/api/attachment_dir_api.go
+++ b/pkg/internal/server/api/attachment_dir_api.go
@@ -18,11 +18,13 @@ func listAttachment(c *fiber.Ctx) error {
 
 	tx := database.C
 
-	var author models.Account
-	if err := database.C.Where("name = ?", c.Query("author")).Error; err != nil {
-		return fiber.NewError(fiber.StatusBadRequest, err.Error())
-	} else {
-		tx = tx.Where("account_id = ?", author.ID)
+	if len(c.Query("author")) > 0 {
+		var author models.Account
+		if err := database.C.Where("name = ?", c.Query("author")).First(&author).Error; err != nil {
+			return fiber.NewError(fiber.StatusBadRequest, err.Error())
+		} else {
+			tx = tx.Where("account_id = ?", author.ID)
+		}
 	}
 
 	if usage := strings.Split(c.Query("usage"), " "); len(usage) > 0 {