diff --git a/LaunchServer/source/auth/provider/AuthProvider.java b/LaunchServer/source/auth/provider/AuthProvider.java
index c8eee41..26dbedf 100644
--- a/LaunchServer/source/auth/provider/AuthProvider.java
+++ b/LaunchServer/source/auth/provider/AuthProvider.java
@@ -9,6 +9,7 @@
 import launcher.helper.VerifyHelper;
 import launcher.serialize.config.ConfigObject;
 import launcher.serialize.config.entry.BlockConfigEntry;
+import launchserver.auth.AuthException;
 
 public abstract class AuthProvider extends ConfigObject implements Flushable {
 	private static final Map<String, Adapter<AuthProvider>> AUTH_PROVIDERS = new ConcurrentHashMap<>(8);
@@ -22,6 +23,11 @@
 	public abstract String auth(String login, String password) throws Exception;
 
 	@LauncherAPI
+	public static String authError(String message) throws AuthException {
+		throw new AuthException(message);
+	}
+
+	@LauncherAPI
 	public static AuthProvider newProvider(String name, BlockConfigEntry block) {
 		VerifyHelper.verifyIDName(name);
 		Adapter<AuthProvider> authHandlerAdapter = VerifyHelper.getMapValue(AUTH_PROVIDERS, name,
diff --git a/LaunchServer/source/auth/provider/DigestAuthProvider.java b/LaunchServer/source/auth/provider/DigestAuthProvider.java
index e5d5d6d..fab94bf 100644
--- a/LaunchServer/source/auth/provider/DigestAuthProvider.java
+++ b/LaunchServer/source/auth/provider/DigestAuthProvider.java
@@ -41,7 +41,7 @@
 
 		// Verify is valid
 		if (!valid) {
-			throw new AuthException("Incorrect username or password");
+			authError("Incorrect username or password");
 		}
 	}
 }
diff --git a/LaunchServer/source/auth/provider/HTTPAuthProvider.java b/LaunchServer/source/auth/provider/HTTPAuthProvider.java
index 7e7ce0f..8e5f978 100644
--- a/LaunchServer/source/auth/provider/HTTPAuthProvider.java
+++ b/LaunchServer/source/auth/provider/HTTPAuthProvider.java
@@ -9,7 +9,6 @@
 import launcher.helper.IOHelper;
 import launcher.serialize.config.entry.BlockConfigEntry;
 import launcher.serialize.config.entry.StringConfigEntry;
-import launchserver.auth.AuthException;
 
 public final class HTTPAuthProvider extends AuthProvider {
 	private final String url;
@@ -24,11 +23,11 @@
 	@Override
 	public String auth(String login, String password) throws IOException {
 		String currentResponse = IOHelper.request(new URL(getFormattedURL(login, password)));
+
+		// Match username
 		Matcher matcher = response.matcher(currentResponse);
-		if (!matcher.matches() || matcher.groupCount() < 1) {
-			throw new AuthException(currentResponse);
-		}
-		return matcher.group("username");
+		return matcher.matches() && matcher.groupCount() >= 1 ?
+			matcher.group("username") : authError(currentResponse);
 	}
 
 	@Override
diff --git a/LaunchServer/source/auth/provider/MySQLAuthProvider.java b/LaunchServer/source/auth/provider/MySQLAuthProvider.java
index e19f9cc..236f89c 100644
--- a/LaunchServer/source/auth/provider/MySQLAuthProvider.java
+++ b/LaunchServer/source/auth/provider/MySQLAuthProvider.java
@@ -36,12 +36,8 @@
 
 				// Execute SQL query
 				try (ResultSet set = statement.executeQuery()) {
-					if (!set.next()) {
-						throw new AuthException("Incorrect username or password");
-					}
-
-					// Get username
-					return set.getString(1);
+					return set.next() ? set.getString(1) :
+						authError("Incorrect username or password");
 				}
 			}
 		}
diff --git a/LaunchServer/source/auth/provider/RejectAuthProvider.java b/LaunchServer/source/auth/provider/RejectAuthProvider.java
index 6773ebd..23ee57b 100644
--- a/LaunchServer/source/auth/provider/RejectAuthProvider.java
+++ b/LaunchServer/source/auth/provider/RejectAuthProvider.java
@@ -15,7 +15,7 @@
 
 	@Override
 	public String auth(String login, String password) throws AuthException {
-		throw new AuthException(message);
+		return authError(message);
 	}
 
 	@Override
diff --git a/Launcher/runtime/engine/api.js b/Launcher/runtime/engine/api.js
index 8bf0159..a42c7ea 100755
--- a/Launcher/runtime/engine/api.js
+++ b/Launcher/runtime/engine/api.js
@@ -62,7 +62,10 @@
 var VerifyHelper = VerifyHelperClass.static;
 
 // Helper JS class API imports
-var JSApplication = JSApplicationClass.static;
+var JSApplication = null;
+if(typeof JSApplicationClass !== 'undefined') {
+	JSApplication = JSApplicationClass.static;
+}
 
 // API wrapper
 function tryWithResources(closeable, f) {