diff --git a/TTS/tts/configs/fast_speech_config.py b/TTS/tts/configs/fast_speech_config.py
index e3d25cff..31d99442 100644
--- a/TTS/tts/configs/fast_speech_config.py
+++ b/TTS/tts/configs/fast_speech_config.py
@@ -143,7 +143,7 @@ class FastSpeechConfig(BaseTTSConfig):
     r: int = 1  # DO NOT CHANGE
 
     # dataset configs
-    compute_f0: bool = False 
+    compute_f0: bool = False
     f0_cache_path: str = None
 
     # testing
diff --git a/TTS/tts/datasets/__init__.py b/TTS/tts/datasets/__init__.py
index 0885f633..4fae974f 100644
--- a/TTS/tts/datasets/__init__.py
+++ b/TTS/tts/datasets/__init__.py
@@ -91,6 +91,8 @@ def load_tts_samples(
                 for idx, ins in enumerate(meta_data_eval_all):
                     attn_file = meta_data[ins[1]].strip()
                     meta_data_eval_all[idx].append(attn_file)
+        # set none for the next iter
+        formatter = None
     return meta_data_train_all, meta_data_eval_all
 
 
diff --git a/TTS/tts/datasets/formatters.py b/TTS/tts/datasets/formatters.py
index a2f9cb27..425eb0cd 100644
--- a/TTS/tts/datasets/formatters.py
+++ b/TTS/tts/datasets/formatters.py
@@ -61,9 +61,9 @@ def mozilla_de(root_path, meta_file):
 
 def mailabs(root_path, meta_files=None):
     """Normalizes M-AI-Labs meta data files to TTS format
-    
+
     Args:
-        root_path (str): root folder of the MAILAB language folder. 
+        root_path (str): root folder of the MAILAB language folder.
         meta_files (str):  list of meta files to be used in the training. If None, finds all the csv files
             recursively. Defaults to None
     """