diff --git a/src/Info.plist b/src/Info.plist
index dff6d15..fcaba38 100644
--- a/src/Info.plist
+++ b/src/Info.plist
@@ -25,7 +25,7 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>3.1.0-beta</string>
+	<string>3.1.0-rc1</string>
 	<key>CFBundleSignature</key>
 	<string>abgK</string>
 	<key>CFBundleURLTypes</key>
@@ -49,7 +49,7 @@
 		</dict>
 	</array>
 	<key>CFBundleVersion</key>
-	<string>917</string>
+	<string>918</string>
 	<key>Fabric</key>
 	<dict>
 		<key>Kits</key>
diff --git a/src/WLConnection.m b/src/WLConnection.m
index bf41dcc..725559f 100644
--- a/src/WLConnection.m
+++ b/src/WLConnection.m
@@ -210,7 +210,7 @@ - (void)monitorArticleAtBackground {
                     NSTextCheckingResult *result;
                     NSString *combinedString=@"";
                     for( WLArticle* article in resultArray) {
-                        if(article.needTrack > 0 && article.astatus < 2) { // need track AND article is not delteed
+                        if(article.needTrack > 0 && article.astatus < 2 && _connected) { // need track AND article is not delteed
                             STHTTPRequest *r = [STHTTPRequest requestWithURLString:[NSString stringWithFormat:@"https://www.ptt.cc/bbs/%@.html", article.url]];
                             [r addCookieWithName:@"over18" value:@"1"];
                             [r setHeaderWithName:@"User-Agent" value:@"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Safari/604.1.38"];
@@ -354,6 +354,7 @@ - (void)monitorArticleAtBackground {
                 } // end of resultArray > 0
                 [NSThread sleepForTimeInterval:300];
             } // end for inifinte loop
+            return;
         });
     }
 }