diff --git a/src/database/mongo/hash.js b/src/database/mongo/hash.js
index aef54bf124..263ad79849 100644
--- a/src/database/mongo/hash.js
+++ b/src/database/mongo/hash.js
@@ -277,7 +277,7 @@ module.exports = function (db, module) {
 		callback = callback || helpers.noop;
 		value = parseInt(value, 10);
 		if (!key || isNaN(value)) {
-			return callback();
+			return callback(null, null);
 		}
 
 		var data = {};
diff --git a/src/database/redis/hash.js b/src/database/redis/hash.js
index 1a9388f0a2..6f3c799027 100644
--- a/src/database/redis/hash.js
+++ b/src/database/redis/hash.js
@@ -117,14 +117,18 @@ module.exports = function (redisClient, module) {
 	};
 
 	module.incrObjectField = function (key, field, callback) {
-		redisClient.hincrby(key, field, 1, callback);
+		module.incrObjectFieldBy(key, field, 1, callback);
 	};
 
 	module.decrObjectField = function (key, field, callback) {
-		redisClient.hincrby(key, field, -1, callback);
+		module.incrObjectFieldBy(key, field, -1, callback);
 	};
 
 	module.incrObjectFieldBy = function (key, field, value, callback) {
+		value = parseInt(value, 10);
+		if (!key || isNaN(value)) {
+			return callback(null, null);
+		}
 		redisClient.hincrby(key, field, value, callback);
 	};
 };
diff --git a/test/database/hash.js b/test/database/hash.js
index 3eb84c693b..cd64acba56 100644
--- a/test/database/hash.js
+++ b/test/database/hash.js
@@ -438,5 +438,17 @@ describe('Hash methods', function () {
 				done();
 			});
 		});
+
+		it('should return null if value is NaN', function (done) {
+			db.incrObjectFieldBy('testObject15', 'lastonline', 'notanumber', function (err, newValue) {
+				assert.ifError(err);
+				assert.strictEqual(newValue, null);
+				db.isObjectField('testObject15', 'lastonline', function (err, isField) {
+					assert.ifError(err);
+					assert(!isField);
+					done();
+				});
+			});
+		});
 	});
 });