diff --git a/tests/TestException.php b/tests/TestException.php
new file mode 100644
index 00000000..434fd085
--- /dev/null
+++ b/tests/TestException.php
@@ -0,0 +1,45 @@
+<?php
+declare(strict_types=1);
+namespace JKingWeb\NewsSync;
+
+
+class TestException extends \PHPUnit\Framework\TestCase {
+	use TestingHelpers;
+
+	static function setUpBeforeClass() {
+		Lang::set("");
+	}
+
+	static function tearDownAfterClass() {
+		Lang::set(Lang::DEFAULT);
+	}
+	
+	function testBasic() {
+		$this->assertException("unknown");
+		throw new Exception("unknown");
+	}
+
+	/**
+     * @depends testBasic
+     */
+	function testPlain() {
+		$this->assertException("unknown");
+		throw new Exception();
+	}
+	
+	/**
+     * @depends testBasic
+     */
+	function testNamespace() {
+		$this->assertException("fileMissing", "Lang");
+		throw new Lang\Exception("fileMissing");
+	}
+
+	/**
+     * @depends testNamespace
+     */
+	function testValues() {
+		$this->assertException("fileMissing", "Lang");
+		throw new Lang\Exception("fileMissing", "en");
+	}
+}
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 470d86a2..c4c2368c 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -55,6 +55,6 @@ trait LanguageTestingHelpers {
 		self::$vfs = null;
 		self::$files = null;
 		Lang::set("", true);
-		Lang::set(Lang::DEFAULT, true);
+		Lang::set(Lang::DEFAULT);
 	}
 }
\ No newline at end of file
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index 2e2fb7ff..8b1dbd80 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -12,6 +12,7 @@
 <testsuite name="Localization and exceptions">
 	<file>TestLang.php</file>
 	<file>TestLangComplex.php</file>
+	<file>TestException.php</file>
 </testsuite>
 
 <testsuite name="Configuration loading and saving">
diff --git a/vendor/JKingWeb/NewsSync/Exception.php b/vendor/JKingWeb/NewsSync/Exception.php
index 93b869fb..2e61d689 100644
--- a/vendor/JKingWeb/NewsSync/Exception.php
+++ b/vendor/JKingWeb/NewsSync/Exception.php
@@ -41,8 +41,8 @@ class Exception extends \Exception {
 
 	public function __construct(string $msgID = "", $vars = null, \Throwable $e = null) {
 		if($msgID=="") {
-			$msg = "";
-			$code = 0;
+			$msg = "Exception.unknown";
+			$code = 10000;
 		} else {
 			$codeID = str_replace("\\", "/", str_replace(NS_BASE, "", get_called_class())).".$msgID";
 			if(!array_key_exists($codeID,self::CODES)) {
diff --git a/vendor/JKingWeb/NewsSync/Lang.php b/vendor/JKingWeb/NewsSync/Lang.php
index ed47ae45..9ae9e681 100644
--- a/vendor/JKingWeb/NewsSync/Lang.php
+++ b/vendor/JKingWeb/NewsSync/Lang.php
@@ -7,6 +7,7 @@ class Lang {
 	const DEFAULT = "en";
 	const REQUIRED = [
 		'Exception.JKingWeb/NewsSync/Exception.uncoded'                     => 'The specified exception symbol {0} has no code specified in Exception.php',
+		'Exception.JKingWeb/NewsSync/Exception.unknown'						=> 'An unknown error has occurred',
 		'Exception.JKingWeb/NewsSync/Lang/Exception.defaultFileMissing'		=> 'Default language file "{0}" missing',
 		'Exception.JKingWeb/NewsSync/Lang/Exception.fileMissing'			=> 'Language file "{0}" is not available',
 		'Exception.JKingWeb/NewsSync/Lang/Exception.fileUnreadable'			=> 'Insufficient permissions to read language file "{0}"',