diff --git a/.travis.yml b/.travis.yml
index 68a01cbaf..2eb13e1fb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,4 @@
+sudo: false
 language: csharp
 solution: ArchiSteamFarm.sln
 
diff --git a/ConfigGenerator/ConfigGenerator.csproj b/ConfigGenerator/ConfigGenerator.csproj
index 2bf79bff0..d3b742478 100644
--- a/ConfigGenerator/ConfigGenerator.csproj
+++ b/ConfigGenerator/ConfigGenerator.csproj
@@ -48,7 +48,6 @@
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
-    <Reference Include="System.Deployment" />
     <Reference Include="System.Drawing" />
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Windows.Forms" />
diff --git a/ConfigGenerator/GlobalConfig.cs b/ConfigGenerator/GlobalConfig.cs
index 64b8fec37..4a319e2b5 100644
--- a/ConfigGenerator/GlobalConfig.cs
+++ b/ConfigGenerator/GlobalConfig.cs
@@ -36,6 +36,13 @@ namespace ConfigGenerator {
 			Experimental
 		}
 
+		private const byte DefaultMaxFarmingTime = 10;
+		private const byte DefaultFarmingDelay = 5;
+		private const byte DefaultHttpTimeout = 60;
+		private const ushort DefaultWCFPort = 1242;
+
+		private static readonly ProtocolType DefaultSteamProtocol = ProtocolType.Tcp;
+
 		// This is hardcoded blacklist which should not be possible to change
 		internal static readonly HashSet<uint> GlobalBlacklist = new HashSet<uint> { 267420, 303700, 335590, 368020, 425280 };
 
@@ -49,19 +56,19 @@ namespace ConfigGenerator {
 		public EUpdateChannel UpdateChannel { get; set; } = EUpdateChannel.Stable;
 
 		[JsonProperty(Required = Required.DisallowNull)]
-		public ProtocolType SteamProtocol { get; set; } = ProtocolType.Tcp;
+		public ProtocolType SteamProtocol { get; set; } = DefaultSteamProtocol;
 
 		[JsonProperty(Required = Required.DisallowNull)]
 		public ulong SteamOwnerID { get; set; } = 0;
 
 		[JsonProperty(Required = Required.DisallowNull)]
-		public byte MaxFarmingTime { get; set; } = 10;
+		public byte MaxFarmingTime { get; set; } = DefaultMaxFarmingTime;
 
 		[JsonProperty(Required = Required.DisallowNull)]
 		public byte IdleFarmingPeriod { get; set; } = 3;
 
 		[JsonProperty(Required = Required.DisallowNull)]
-		public byte FarmingDelay { get; set; } = 5;
+		public byte FarmingDelay { get; set; } = DefaultFarmingDelay;
 
 		[JsonProperty(Required = Required.DisallowNull)]
 		public byte AccountPlayingDelay { get; set; } = 5;
@@ -76,13 +83,13 @@ namespace ConfigGenerator {
 		public bool ForceHttp { get; set; } = false;
 
 		[JsonProperty(Required = Required.DisallowNull)]
-		public byte HttpTimeout { get; set; } = 60;
+		public byte HttpTimeout { get; set; } = DefaultHttpTimeout;
 
-		[JsonProperty(Required = Required.DisallowNull)]
+		[JsonProperty]
 		public string WCFHostname { get; set; } = "localhost";
 
 		[JsonProperty(Required = Required.DisallowNull)]
-		public ushort WCFPort { get; set; } = 1242;
+		public ushort WCFPort { get; set; } = DefaultWCFPort;
 
 		[JsonProperty(Required = Required.DisallowNull)]
 		public bool LogToFile { get; set; } = true;
@@ -111,23 +118,43 @@ namespace ConfigGenerator {
 				globalConfig = JsonConvert.DeserializeObject<GlobalConfig>(File.ReadAllText(filePath));
 			} catch (Exception e) {
 				Logging.LogGenericException(e);
-				return new GlobalConfig(filePath);
+				return null;
 			}
 
-			globalConfig.FilePath = filePath;
-
 			// SK2 supports only TCP and UDP steam protocols
-			// Make sure that user can't screw this up
+			// Ensure that user can't screw this up
 			switch (globalConfig.SteamProtocol) {
 				case ProtocolType.Tcp:
 				case ProtocolType.Udp:
 					break;
 				default:
-					Logging.LogGenericWarning("Configured SteamProtocol is invalid: " + globalConfig.SteamProtocol + ", default TCP protocol will be used instead");
-					globalConfig.SteamProtocol = ProtocolType.Tcp;
+					Logging.LogGenericWarning("Configured SteamProtocol is invalid: " + globalConfig.SteamProtocol + ". Value of " + DefaultSteamProtocol + " will be used instead");
+					globalConfig.SteamProtocol = DefaultSteamProtocol;
 					break;
 			}
 
+			// User might not know what he's doing
+			// Ensure that he can't screw core ASF variables
+			if (globalConfig.MaxFarmingTime == 0) {
+				Logging.LogGenericWarning("Configured MaxFarmingTime is invalid: " + globalConfig.MaxFarmingTime + ". Value of " + DefaultMaxFarmingTime + " will be used instead");
+				globalConfig.MaxFarmingTime = DefaultMaxFarmingTime;
+			}
+
+			if (globalConfig.FarmingDelay == 0) {
+				Logging.LogGenericWarning("Configured FarmingDelay is invalid: " + globalConfig.FarmingDelay + ". Value of " + DefaultFarmingDelay + " will be used instead");
+				globalConfig.FarmingDelay = DefaultFarmingDelay;
+			}
+
+			if (globalConfig.HttpTimeout == 0) {
+				Logging.LogGenericWarning("Configured HttpTimeout is invalid: " + globalConfig.HttpTimeout + ". Value of " + DefaultHttpTimeout + " will be used instead");
+				globalConfig.HttpTimeout = DefaultHttpTimeout;
+			}
+
+			if (globalConfig.WCFPort == 0) {
+				Logging.LogGenericWarning("Configured WCFPort is invalid: " + globalConfig.WCFPort + ". Value of " + DefaultWCFPort + " will be used instead");
+				globalConfig.WCFPort = DefaultWCFPort;
+			}
+
 			return globalConfig;
 		}