diff --git a/src/socket.io/admin/user.js b/src/socket.io/admin/user.js
index d8d9a0f282..6b2853447b 100644
--- a/src/socket.io/admin/user.js
+++ b/src/socket.io/admin/user.js
@@ -2,6 +2,7 @@
 
 var async = require('async');
 var validator = require('validator');
+var winston = require('winston');
 
 var db = require('../../database');
 var groups = require('../../groups');
@@ -146,37 +147,46 @@ function deleteUsers(socket, uids, method, callback) {
 	if (!Array.isArray(uids)) {
 		return callback(new Error('[[error:invalid-data]]'));
 	}
+	async.waterfall([
+		function (next) {
+			groups.isMembers(uids, 'administrators', next);
+		},
+		function (isMembers, next) {
+			if (isMembers.includes(true)) {
+				return callback(new Error('[[error:cant-delete-other-admins]]'));
+			}
 
-	async.each(uids, function (uid, next) {
-		async.waterfall([
-			function (next) {
-				user.isAdministrator(uid, next);
-			},
-			function (isAdmin, next) {
-				if (isAdmin) {
-					return next(new Error('[[error:cant-delete-other-admins]]'));
-				}
+			callback();
 
-				method(uid, next);
-			},
-			function (next) {
-				events.log({
-					type: 'user-delete',
-					uid: socket.uid,
-					targetUid: uid,
-					ip: socket.ip,
-				}, next);
-			},
-			function (next) {
-				plugins.fireHook('action:user.delete', {
-					callerUid: socket.uid,
-					uid: uid,
-					ip: socket.ip,
-				});
-				next();
-			},
-		], next);
-	}, callback);
+			async.each(uids, function (uid, next) {
+				async.waterfall([
+					function (next) {
+						method(uid, next);
+					},
+					function (next) {
+						events.log({
+							type: 'user-delete',
+							uid: socket.uid,
+							targetUid: uid,
+							ip: socket.ip,
+						}, next);
+					},
+					function (next) {
+						plugins.fireHook('action:user.delete', {
+							callerUid: socket.uid,
+							uid: uid,
+							ip: socket.ip,
+						});
+						next();
+					},
+				], next);
+			}, next);
+		},
+	], function (err) {
+		if (err) {
+			winston.error(err);
+		}
+	});
 }
 
 User.search = function (socket, data, callback) {
diff --git a/src/socket.io/topics.js b/src/socket.io/topics.js
index 4468b4fb53..bbeda1bee5 100644
--- a/src/socket.io/topics.js
+++ b/src/socket.io/topics.js
@@ -2,7 +2,6 @@
 
 var async = require('async');
 
-var db = require('../database');
 var topics = require('../topics');
 var posts = require('../posts');
 var websockets = require('./index');
@@ -73,22 +72,7 @@ SocketTopics.postcount = function (socket, tid, callback) {
 				return next(new Error('[[no-privileges]]'));
 			}
 
-			async.parallel({
-				replyCount: function (next) {
-					db.sortedSetCard('tid:' + tid + ':posts', next);
-				},
-				topicData: function (next) {
-					topics.getTopicFields(tid, ['mainPid', 'postcount'], next);
-				},
-			}, next);
-		},
-		function (results, next) {
-			if (results.topicData.mainPid && parseInt(results.topicData.postcount, 10) === parseInt(results.replyCount, 10) + 1) {
-				return next(null, results.topicData.postcount);
-			}
-			var postcount = results.replyCount + (results.topicData.mainPid ? 1 : 0);
-			topics.setTopicField(tid, 'postcount', postcount);
-			next(null, postcount);
+			topics.getTopicField(tid, 'postcount', next);
 		},
 	], callback);
 };
diff --git a/src/user/delete.js b/src/user/delete.js
index 3085a5c404..78320d698e 100644
--- a/src/user/delete.js
+++ b/src/user/delete.js
@@ -15,12 +15,20 @@ var batch = require('../batch');
 var file = require('../file');
 
 module.exports = function (User) {
+	var deletesInProgress = {};
+
 	User.delete = function (callerUid, uid, callback) {
 		if (!parseInt(uid, 10)) {
-			return callback(new Error('[[error:invalid-uid]]'));
+			return setImmediate(callback, new Error('[[error:invalid-uid]]'));
 		}
-
+		if (deletesInProgress[uid]) {
+			return setImmediate(callback);
+		}
+		deletesInProgress[uid] = 'user.delete';
 		async.waterfall([
+			function (next) {
+				removeFromSortedSets(uid, next);
+			},
 			function (next) {
 				deletePosts(callerUid, uid, next);
 			},
@@ -67,14 +75,38 @@ module.exports = function (User) {
 		}, { alwaysStartAt: 0 }, callback);
 	}
 
+	function removeFromSortedSets(uid, callback) {
+		db.sortedSetsRemove([
+			'users:joindate',
+			'users:postcount',
+			'users:reputation',
+			'users:banned',
+			'users:banned:expire',
+			'users:flags',
+			'users:online',
+			'users:notvalidated',
+			'digest:day:uids',
+			'digest:week:uids',
+			'digest:month:uids',
+		], uid, callback);
+	}
+
 	User.deleteAccount = function (uid, callback) {
+		if (deletesInProgress[uid] === 'user.deleteAccount') {
+			return setImmediate(callback);
+		}
+		deletesInProgress[uid] = 'user.deleteAccount';
 		var userData;
 		async.waterfall([
+			function (next) {
+				removeFromSortedSets(uid, next);
+			},
 			function (next) {
 				db.getObject('user:' + uid, next);
 			},
 			function (_userData, next) {
 				if (!_userData || !_userData.username) {
+					delete deletesInProgress[uid];
 					return callback();
 				}
 				userData = _userData;
@@ -113,20 +145,6 @@ module.exports = function (User) {
 							next();
 						}
 					},
-					function (next) {
-						db.sortedSetsRemove([
-							'users:joindate',
-							'users:postcount',
-							'users:reputation',
-							'users:banned',
-							'users:banned:expire',
-							'users:online',
-							'users:notvalidated',
-							'digest:day:uids',
-							'digest:week:uids',
-							'digest:month:uids',
-						], uid, next);
-					},
 					function (next) {
 						db.decrObjectField('global', 'userCount', next);
 					},
@@ -164,7 +182,10 @@ module.exports = function (User) {
 			function (results, next) {
 				db.deleteAll(['followers:' + uid, 'following:' + uid, 'user:' + uid], next);
 			},
-		], callback);
+		], function (err) {
+			delete deletesInProgress[uid];
+			callback(err);
+		});
 	};
 
 	function deleteVotes(uid, callback) {
diff --git a/test/socket.io.js b/test/socket.io.js
index 40f4d813b4..d56e01a087 100644
--- a/test/socket.io.js
+++ b/test/socket.io.js
@@ -198,11 +198,13 @@ describe('socket.io', function () {
 		it('should delete users', function (done) {
 			socketAdmin.user.deleteUsers({ uid: adminUid }, [uid], function (err) {
 				assert.ifError(err);
-				groups.isMember(uid, 'registered-users', function (err, isMember) {
-					assert.ifError(err);
-					assert(!isMember);
-					done();
-				});
+				setTimeout(function () {
+					groups.isMember(uid, 'registered-users', function (err, isMember) {
+						assert.ifError(err);
+						assert(!isMember);
+						done();
+					});
+				}, 500);
 			});
 		});