diff --git a/app/Models/Topic.php b/app/Models/Topic.php
index 1da86965..3dcd9258 100644
--- a/app/Models/Topic.php
+++ b/app/Models/Topic.php
@@ -14,7 +14,7 @@ class Topic extends NexusModel
 
     public function forum()
     {
-        return $this->belongsTo(Forum::class. 'forumid');
+        return $this->belongsTo(Forum::class, 'forumid');
     }
 
     public function firstPost()
diff --git a/public/forums.php b/public/forums.php
index acddccbe..ff817abf 100644
--- a/public/forums.php
+++ b/public/forums.php
@@ -204,8 +204,10 @@ function insert_compose_frame($id, $type = 'new')
 				stderr($lang_forums['std_error'], $lang_forums['std_no_post_id']);
 			$arr = mysql_fetch_assoc($res);
 			$body = "[quote=".htmlspecialchars($arr["username"])."]".htmlspecialchars(unesc($arr["body"]))."[/quote]";
+			$postid = $id;	
 			$id = $topicid;
 			$type = 'reply';
+			print("<input type=\"hidden\" name=\"postid\" value=\"".$postid."\" />");
 			break;
 		}
 		case 'edit':
@@ -347,6 +349,7 @@ if ($action == "post")
 			check_whether_exist($id, 'topic');
 			$topicid = $id;
 			$forumid = get_single_value("topics", "forumid", "WHERE id=".sqlesc($topicid));
+			$quotepostid = $_POST["postid"];
 			break;
 		}
 		case 'edit':
@@ -466,23 +469,46 @@ if ($action == "post")
 		$postid = mysql_insert_id() or die($lang_forums['std_post_id_not_available']);
 		//send pm
         $topicInfo = \App\Models\Topic::query()->findOrFail($topicid);
+		$postInfo = \App\Models\Post::query()->findOrFail($quotepostid);
         $postUrl = sprintf('[url=forums.php?action=viewtopic&topicid=%s&page=p%s#pid%s]%s[/url]', $topicid, $postid, $postid, $topicInfo->subject);
-        if ($type == 'reply' && $topicInfo->userid != $CURUSER['id']) {
-            /** @var \App\Models\User $receiver */
-            $receiver = $topicInfo->user;
-            if ($receiver->acceptNotification('topic_reply')) {
-                $locale = $receiver->locale;
-                $notify = [
-                    'sender' => 0,
-                    'receiver' => $receiver->id,
-                    'subject' => nexus_trans('forum.topic.replied_notify_subject', [], $locale),
-                    'msg' => nexus_trans('forum.topic.replied_notify_body', ['topic_subject' => $postUrl], $locale),
-                    'added' => now(),
-                ];
-                \App\Models\Message::query()->insert($notify);
-                \Nexus\Database\NexusDB::cache_del("user_{$topicInfo->userid}_unread_message_count");
-                \Nexus\Database\NexusDB::cache_del("user_{$topicInfo->userid}_inbox_count");
-            }
+
+		if ($type == 'reply') {
+			/** @var \App\Models\User $receiver */
+			if (!empty($topicInfo->userid) && $topicInfo->userid != $CURUSER['id'])
+			{
+				$receiver = $topicInfo->user;
+				if ($receiver->acceptNotification('topic_reply')) {
+					$locale = $receiver->locale;
+					$notify = [
+						'sender' => 0,
+						'receiver' => $receiver->id,
+						'subject' => nexus_trans('forum.topic.replied_notify_subject', [], $locale),
+						'msg' => nexus_trans('forum.topic.replied_notify_body', ['topic_subject' => $postUrl], $locale),
+						'added' => now(),
+					];
+					\App\Models\Message::query()->insert($notify);
+					\Nexus\Database\NexusDB::cache_del("user_{$topicInfo->userid}_unread_message_count");
+					\Nexus\Database\NexusDB::cache_del("user_{$topicInfo->userid}_inbox_count");
+				}
+			}
+
+			if (!empty($postInfo->userid) && $postInfo->userid != $CURUSER['id']) 
+			{
+				$receiver = $postInfo->user;
+				if($receiver->acceptNotification('topic_reply')) {
+					$locale = $receiver->locale;
+					$notify = [
+						'sender' => 0,
+						'receiver' => $receiver->id,
+						'subject' => nexus_trans('forum.reply.replied_notify_subject', [], $locale),
+						'msg' => nexus_trans('forum.reply.replied_notify_body', ['topic_subject' => $postUrl, 'replyer' => $CURUSER['username']], $locale),
+						'added' => now(),
+					];
+					\App\Models\Message::query()->insert($notify);
+					\Nexus\Database\NexusDB::cache_del("user_{$postInfo->userid}_unread_message_count");
+					\Nexus\Database\NexusDB::cache_del("user_{$postInfo->userid}_inbox_count");
+				}				
+			}
         }
 
 		$Cache->delete_value('forum_'.$forumid.'_post_'.$today_date.'_count');
diff --git a/resources/lang/en/forum.php b/resources/lang/en/forum.php
index 8e367e6d..ab3cdab7 100644
--- a/resources/lang/en/forum.php
+++ b/resources/lang/en/forum.php
@@ -8,5 +8,9 @@ return [
     'post' => [
         'edited_notify_subject' => 'Post reply was modified',
         'edited_notify_body' => 'Your reply to topic: :topic_subject was modified by: :editor.',
+    ],
+    'reply' => [
+        'replied_notify_subject' => 'Your reply has a new reply',
+        'replied_notify_body' => 'Your reply to topic：:topic_subject was replied by :replyer.',
     ]
 ];
diff --git a/resources/lang/zh_CN/forum.php b/resources/lang/zh_CN/forum.php
index f76637fe..f8aca3c3 100644
--- a/resources/lang/zh_CN/forum.php
+++ b/resources/lang/zh_CN/forum.php
@@ -8,5 +8,9 @@ return [
     'post' => [
         'edited_notify_subject' => '帖子回复被修改',
         'edited_notify_body' => '你在帖子：:topic_subject 的回复被：:editor 修改。',
+    ],
+    'reply' => [
+        'replied_notify_subject' => '帖子回复有了新回复',
+        'replied_notify_body' => '你在帖子：:topic_subject 的回复被：:replyer 回复。',
     ]
 ];
diff --git a/resources/lang/zh_TW/forum.php b/resources/lang/zh_TW/forum.php
index 5c5b9990..f4eaf976 100644
--- a/resources/lang/zh_TW/forum.php
+++ b/resources/lang/zh_TW/forum.php
@@ -8,5 +8,9 @@ return [
     'post' => [
         'edited_notify_subject' => '帖子回復被修改',
         'edited_notify_body' => '你在帖子：:topic_subject 的回復被：:editor 修改。',
+    ],
+    'reply' => [
+        'replied_notify_subject' => '帖子回復有了新回復',
+        'replied_notify_body' => '你在帖子：:topic_subject 的回復被：:replyer 回復。',
     ]
 ];