diff --git a/src/database/level/hash.js b/src/database/level/hash.js
index c321fc9dae..b35a1b1193 100644
--- a/src/database/level/hash.js
+++ b/src/database/level/hash.js
@@ -18,7 +18,7 @@ module.exports = function(db, module) {
 			}
 		], function(err) {
 			if (typeof callback === 'function') {
-				callback(err, obj);
+				callback(err);
 			}
 		});
 	};
@@ -42,7 +42,7 @@ module.exports = function(db, module) {
 					if (typeof callback === 'function') {
 						callback(err, obj);
 					}
-				});	
+				});
 			} else {
 				if (typeof callback === 'function') {
 					callback(err, {});
diff --git a/src/database/level/list.js b/src/database/level/list.js
index 28a899f001..ca579178f0 100644
--- a/src/database/level/list.js
+++ b/src/database/level/list.js
@@ -2,7 +2,7 @@
 
 module.exports = function(db, module) {
 	var helpers = module.helpers.level;
-	
+
 	module.listPrepend = function(key, value, callback) {
 		module.getListRange(key, 0, -1, function(err, list) {
 			var arr = list || [];
@@ -17,7 +17,7 @@ module.exports = function(db, module) {
 			arr.push(value);
 			module.set(key, arr, function(err) {
 				if (typeof callback === 'function') {
-					callback(err, list);
+					callback(err);
 				}
 			});
 		});
diff --git a/src/database/level/sets.js b/src/database/level/sets.js
index 5d6ffabf6c..df10f4a632 100644
--- a/src/database/level/sets.js
+++ b/src/database/level/sets.js
@@ -6,13 +6,15 @@ module.exports = function(db, module) {
 	var helpers = module.helpers.level;
 
 	module.setAdd = function(key, value, callback) {
+		callback = callback || function() {};
 		module.getListRange(key, 0, -1, function(err, set) {
+			if (err) {
+				return callback(err);
+			}
 			if (set.indexOf(value) === -1) {
 				module.listAppend(key, value, callback);
 			} else {
-				if (typeof callback === 'function') {
-					callback(null, []); // verify if it sends back true on redis?
-				}
+				callback(null);
 			}
 		});
 	};
diff --git a/src/database/mongo.js b/src/database/mongo.js
index affb658dba..9976d323ab 100644
--- a/src/database/mongo.js
+++ b/src/database/mongo.js
@@ -38,6 +38,9 @@
 		}
 	];
 
+	module.helpers = module.helpers || {};
+	module.helpers.mongo = require('./mongo/helpers');
+
 	module.init = function(callback) {
 		try {
 			mongoClient = require('mongodb').MongoClient;
@@ -116,7 +119,5 @@
 		db.close();
 	};
 
-	module.helpers = module.helpers || {};
-	module.helpers.mongo = require('./mongo/helpers');
 }(exports));
 
diff --git a/src/database/mongo/hash.js b/src/database/mongo/hash.js
index 92db4662b6..78b2e9a61c 100644
--- a/src/database/mongo/hash.js
+++ b/src/database/mongo/hash.js
@@ -6,7 +6,9 @@ module.exports = function(db, module) {
 	module.setObject = function(key, data, callback) {
 		callback = callback || helpers.noop;
 		data._key = key;
-		db.collection('objects').update({_key:key}, {$set:data}, {upsert:true, w: 1}, callback);
+		db.collection('objects').update({_key:key}, {$set:data}, {upsert:true, w: 1}, function(err) {
+			callback(err);
+		});
 	};
 
 	module.setObjectField = function(key, field, value, callback) {
diff --git a/src/database/mongo/sets.js b/src/database/mongo/sets.js
index 264a950165..e7d606092a 100644
--- a/src/database/mongo/sets.js
+++ b/src/database/mongo/sets.js
@@ -24,7 +24,9 @@ module.exports = function(db, module) {
 		}, {
 			upsert: true,
 			w: 1
-		}, callback);
+		}, function(err) {
+			callback(err);
+		});
 	};
 
 	module.setRemove = function(key, value, callback) {
diff --git a/src/database/redis/hash.js b/src/database/redis/hash.js
index 63a85f77ec..b4fb033348 100644
--- a/src/database/redis/hash.js
+++ b/src/database/redis/hash.js
@@ -3,7 +3,9 @@
 module.exports = function(redisClient, module) {
 	module.setObject = function(key, data, callback) {
 		callback = callback || function() {};
-		redisClient.hmset(key, data, callback);
+		redisClient.hmset(key, data, function(err) {
+			callback(err);
+		});
 	};
 
 	module.setObjectField = function(key, field, value, callback) {
diff --git a/src/database/redis/sets.js b/src/database/redis/sets.js
index 88db7ad36a..2ceb2cb252 100644
--- a/src/database/redis/sets.js
+++ b/src/database/redis/sets.js
@@ -2,7 +2,10 @@
 
 module.exports = function(redisClient, module) {
 	module.setAdd = function(key, value, callback) {
-		redisClient.sadd(key, value, callback);
+		callback = callback || function() {};
+		redisClient.sadd(key, value, function(err) {
+			callback(err);
+		});
 	};
 
 	module.setRemove = function(key, value, callback) {
diff --git a/src/posts.js b/src/posts.js
index 57a97e71ca..c70002f4d0 100644
--- a/src/posts.js
+++ b/src/posts.js
@@ -69,7 +69,7 @@ var async = require('async'),
 			function(postData, next) {
 				db.setObject('post:' + postData.pid, postData, next);
 			},
-			function(result, next) {
+			function(next) {
 				db.sortedSetAdd('posts:pid', timestamp, postData.pid);
 
 				db.incrObjectField('global', 'postCount');
diff --git a/src/topics/create.js b/src/topics/create.js
index 2feb2ae787..7d35e9ba92 100644
--- a/src/topics/create.js
+++ b/src/topics/create.js
@@ -210,7 +210,7 @@ module.exports = function(Topics) {
 			function(next) {
 				Topics.markAsRead(tid, uid, next);
 			},
-			function(result, next) {
+			function(next) {
 				posts.getUserInfoForPosts([postData.uid], next);
 			},
 			function(userInfo, next) {