diff --git a/lib/spider.dart b/lib/spider.dart
index a849fed..bc3c11a 100644
--- a/lib/spider.dart
+++ b/lib/spider.dart
@@ -71,7 +71,7 @@ class Spider {
       if (group.path.isEmpty) {
         exit_with('Exmpty paths are not allowed');
       }
-      if (File(group.path).existsSync()) {
+      if (!FileSystemEntity.isDirectorySync(group.path)) {
         exit_with('Path ${group.path} is not a directory');
       }
       if (!Directory(group.path).existsSync()) {
diff --git a/lib/src/dart_class_generator.dart b/lib/src/dart_class_generator.dart
index c067674..60496ef 100644
--- a/lib/src/dart_class_generator.dart
+++ b/lib/src/dart_class_generator.dart
@@ -103,6 +103,7 @@ ${properties_strings.join('\n')}
   /// 2. should be from one of the allowed types if specified any
   bool _isValidFile(dynamic file) {
     return FileSystemEntity.isFileSync(file.path) &&
+        path.extension(file.path).isNotEmpty &&
         (group.types.isEmpty ||
             group.types.contains(path.extension(file.path)));
   }