diff --git a/src/Exception/Exception.php b/src/Exception/Exception.php
index f5afebf..ef5f9f9 100644
--- a/src/Exception/Exception.php
+++ b/src/Exception/Exception.php
@@ -37,7 +37,7 @@ class Exception extends \Exception {
 	 * @return Exception
 	 */
 	public static function fromMap(array $exceptionMap, $error, ?string $path): Exception {
-		if (isset($exceptionMap[$error])) {
+		if ($error !== null && isset($exceptionMap[$error])) {
 			$exceptionClass = $exceptionMap[$error];
 			if (is_numeric($error)) {
 				return new $exceptionClass($path, (int)$error);