From 70f6eafd06388ce1ee58520713fbc1e3064f8664 Mon Sep 17 00:00:00 2001
From: Yagami <sgm0422@qq.com>
Date: Thu, 21 Feb 2019 17:18:44 +0800
Subject: [PATCH] * Code task #5287.

---
 module/bug/model.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/module/bug/model.php b/module/bug/model.php
index 481078c655..6b9b0df027 100644
--- a/module/bug/model.php
+++ b/module/bug/model.php
@@ -385,7 +385,7 @@ class bugModel extends model
         // Delayed or not?.
         if($bug->deadline != '0000-00-00')
         {
-            if(substr($bug->resolvedDate, 0, 10) != '0000-00-00')
+            if($bug->resolvedDate and substr($bug->resolvedDate, 0, 10) != '0000-00-00')
             {
                 $delay = helper::diffDate(substr($bug->resolvedDate, 0, 10), $bug->deadline);
             }