diff --git a/jstrr.js b/jstrr.js
index 6a83a18..34bf123 100644
--- a/jstrr.js
+++ b/jstrr.js
@@ -373,6 +373,7 @@
 	    tr.style.visibility =
 		tr.classList.contains(team) ? "visible" : visible;
 	}
+	e.target.scrollIntoView({behavior: "smooth", block: "center"});
 	if (mystate.collapsed)
 	    tbl.addEventListener("click", filterSameTeam);
 	else
diff --git a/jtserv/jtserv.rb b/jtserv/jtserv.rb
index 2abbd2d..763956d 100755
--- a/jtserv/jtserv.rb
+++ b/jtserv/jtserv.rb
@@ -421,10 +421,21 @@
 textDB	= Text.new
 connections = {}
 team = Hash.new{|h,k| h[k]=Hash.new}
+socksend = lambda{|sock, msg|
+  begin
+    sock.send(msg)
+  rescue
+    begin
+      connections.close		# Try to close
+    rescue
+    end
+    connections.delete(sock)
+  end
+}
 broadcast = lambda{|hash|
   printf("sending %s\n", hash)
   connections.keys.each do |c|
-    c.send(JSON.generate(hash))
+    socksend.call(c, JSON.generate(hash))
   end
 }
 countUser = lambda{|user|
@@ -504,7 +515,7 @@
         end
         userinfo["text"] = json["text"].to_i
         si = {"scoreinfo" => db.userScoreInfo(userinfo["user"])}
-        ws_conn.send(JSON.generate(si))
+        socksend.call(ws_conn, JSON.generate(si))
       elsif json["finish"]
         user = userinfo["user"]
         if user && user > ""
@@ -524,7 +535,7 @@
           json["finish"] = Time.now.to_f
 STDERR.printf("Start=%.2f, Finish=%.2f\n", json["start"], json["finish"])
           eval  = db.evalStep(user, json)
-          ws_conn.send(JSON.generate(eval))
+          socksend.call(ws_conn, JSON.generate(eval))
           userinfo.delete("typelist")
         end
       elsif json["types"]
@@ -538,12 +549,12 @@
         text = json["ranking"]
         mode = json["mode"]
         rank = db.ranking(text, mode, user)
-        ws_conn.send(JSON.generate({"ranking": rank, "mode": mode}))
+        socksend.call(ws_conn, JSON.generate({"ranking": rank, "mode": mode}))
       elsif json["gettext"]
         db.updateSkey(user, skey)
         userinfo.delete("typelist")	# Reset running typing information 
         r = textDB.getFilledText(json["gettext"], json["lines"], json["fill"])
-        ws_conn.send(JSON.generate({"yourtext" => r}))
+        socksend.call(ws_conn, JSON.generate({"yourtext" => r}))
       end
     else ########## Before authenticated
       userinfo["trial"] ||= 0
@@ -559,14 +570,14 @@
           j = JSON.generate("tmpley" => "notregistered")
         end
         p token
-        ws_conn.send(j)
+        socksend.call(ws_conn, j)
       elsif json["skey"]
         user, skey = json["user"], json["skey"]
         if countUser.call(user) >= WARNMAX
           msg = "いったい何回繋いだら気が済むの?\n"+
                 "限度をわきまえなさい。"
-          ws_conn.send(JSON.generate({"fail" => "overlimit",
-                                      "message" => msg}))
+          socksend.call(ws_conn, JSON.generate({"fail" => "overlimit",
+                                                "message" => msg}))
           next
         end
         skey = db.authKey(user, json["skey"])
@@ -580,10 +591,10 @@
           r = {"user"=>user, "skey"=>skey, "scoreinfo"=>si}
           r["textfiles"] = textDB.textfiles
           j = JSON.generate(r)
-          ws_conn.send(j)		# Login success by skey
+          socksend.call(ws_conn, j)		# Login success by skey
         else
           ## Need too frequent trial barrier here?
-          ws_conn.send(JSON.generate({"fail" => "nokey"}))
+          socksend.call(ws_conn, JSON.generate({"fail" => "nokey"}))
         end
       elsif json["Passcode"]
         token = json["Passcode"]
@@ -599,22 +610,22 @@
           r = {"user"=>user, "skey"=>authkey, "scoreinfo"=>si}
           r["textfiles"] = textDB.textfiles
           j = JSON.generate(r)
-          ws_conn.send(j)		# Login success by token+tmpkey
+          socksend.call(ws_conn, j)	# Login success by token+tmpkey
         else
           case userinfo["trial"]+=1
           when 0..3
           when 4..8
             sleep 3
           else
-            ws_conn.send(JSON.generate({"user"=>user, "fail"=>"byebye"}))
+            socksend.call(ws_conn, JSON.generate({"user"=>user, "fail"=>"byebye"}))
             ws_conn.close
             next
           end
           j = JSON.generate({"user" => user, "fail" => "fail"})
-          ws_conn.send(j)		# Login failure by token
+          socksend.call(ws_conn, j)	# Login failure by token
         end
       else
-        ws_conn.send("No such user")
+        socksend(ws_conn, "No such user")
         ws_conn.close           	# Force guest out
       end
     # broadcast.call({"message" => msg})