diff --git a/beta_batch_encoder/_seek_collector.py b/beta_batch_encoder/_seek_collector.py
index a7604bf..c9411a7 100644
--- a/beta_batch_encoder/_seek_collector.py
+++ b/beta_batch_encoder/_seek_collector.py
@@ -29,8 +29,7 @@ class SeekCollector:
     validate_output_name = lambda _, x: \
         len(x.strip()) == 0 \
         or all(SeekCollector.filename_pattern.match(y) and not y.strip() in SeekCollector.all_output_names for y in x.split(',')) \
-        and SeekCollector.start_positions == len(x.split(',')) \
-        and len(set(x)) == len(x)
+        and SeekCollector.start_positions == len(x.split(',')) 
 
     def __init__(self, source_file):
         self.source_file = source_file
diff --git a/setup.py b/setup.py
index 42b9776..4a153f9 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@ with open('README.md') as f:
 
 setup(
     name='animethemes-beta-batch-encoder',
-    version='1.3',
+    version='1.3.1',
     author='AnimeThemes',
     author_email='admin@animethemes.moe',
     url='https://github.com/AnimeThemes/animethemes-batch-encoder',