From b013f662093376d372d598560552b26b94bf9ece Mon Sep 17 00:00:00 2001
From: Mrs4s <mrs4sxiaoshi@gmail.com>
Date: Mon, 6 Jun 2022 22:40:09 +0800
Subject: [PATCH] fix #1514

---
 modules/mime/mime.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/mime/mime.go b/modules/mime/mime.go
index dbaa831..f6bfa4b 100644
--- a/modules/mime/mime.go
+++ b/modules/mime/mime.go
@@ -31,6 +31,9 @@ func checkImage(r io.ReadSeeker) (ok bool, t string) {
 	if base.SkipMimeScan {
 		return true, ""
 	}
+	if r == nil {
+		return false, "image/nil-stream"
+	}
 	t = scan(r)
 	switch t {
 	case "image/bmp", "image/gif", "image/jpeg", "image/png", "image/webp":