diff --git a/vall_e/engines/__init__.py b/vall_e/engines/__init__.py
index f404254..4caf299 100755
--- a/vall_e/engines/__init__.py
+++ b/vall_e/engines/__init__.py
@@ -132,8 +132,10 @@ def load_engines(training=True, **model_kwargs):
 				params['d_coef'] = params['lr']
 				params['lr'] = 1.0
 			elif cfg.hyperparameters.optimizer.lower() in ["apollo","apollo-mini"]:
+				"""
 				if backend == "deepspeed":
 					raise Exception("APOLLO currently does not play nicely with DeepSpeed.")
+				"""
 
 				optimizer_class = ml.Apollo
 				is_mini = cfg.hyperparameters.optimizer.lower() == "apollo-mini"
diff --git a/vall_e/engines/base.py b/vall_e/engines/base.py
index 61fb4e1..053eb0f 100755
--- a/vall_e/engines/base.py
+++ b/vall_e/engines/base.py
@@ -67,11 +67,12 @@ class Engine():
 		self.lr_scheduler = kwargs['lr_scheduler'] if 'lr_scheduler' in kwargs else None
 
 		stats = kwargs.pop("stats", {})
-		if stats is not None:
-			self.global_steps = stats.pop("global_step", 0)
-			self.micro_steps = stats.pop("micro_step", 0)
-			self.global_samples = stats.pop("global_samples", 0)
-			self.tokens_processed = stats.pop("tokens_processed", 0)
+		if stats is None:
+			stats = {}
+		self.global_steps = stats.pop("global_step", 0)
+		self.micro_steps = stats.pop("micro_step", 0)
+		self.global_samples = stats.pop("global_samples", 0)
+		self.tokens_processed = stats.pop("tokens_processed", 0)
 
 		self._frozen_params = set()
 
@@ -186,7 +187,7 @@ class Engine():
 
 		if not load_path.exists():
 			return
-
+		
 		state = torch_load(load_path, device=cfg.device)
 
 		self.global_steps = state['stats']['global_step'] if 'stats' in state else state['global_step']
@@ -542,8 +543,8 @@ class Engines(dict[str, Engine]):
 
 			# no results are returned when a nan is encountered, so catch it here too
 			if res is None:
-				self.max_nan_losses = self.max_nan_losses - 1
-				if self.max_nan_losses < 0:
+				engine.max_nan_losses = engine.max_nan_losses - 1
+				if engine.max_nan_losses < 0:
 					raise RuntimeError("Too many NaN losses detected.")
 				continue
 			
diff --git a/vall_e/utils/trainer.py b/vall_e/utils/trainer.py
index feb52d4..1d0fa13 100755
--- a/vall_e/utils/trainer.py
+++ b/vall_e/utils/trainer.py
@@ -114,6 +114,10 @@ def _make_infinite_epochs(dl):
 			_logger.info("New epoch starts.")
 
 		with tqdm(dl, "Epoch progress", dynamic_ncols=True, disable=not is_global_leader()) as pbar:
+			if start:
+				pbar.update(start)
+				start = 0
+			"""
 			if start:
 				pbar.n = start
 				start = 0
@@ -121,6 +125,7 @@ def _make_infinite_epochs(dl):
 			# for some reason this is required
 			if manual_update:
 				pbar.n += 1
+			"""
 			yield from pbar