diff --git a/networks/resize_lora.py b/networks/resize_lora.py
index 7b740634..41585f79 100644
--- a/networks/resize_lora.py
+++ b/networks/resize_lora.py
@@ -283,7 +283,10 @@ def resize_lora_model(lora_sd, new_rank, save_dtype, device, dynamic_method, dyn
 
 
 def resize(args):
+  if args.save_to is None or not (args.save_to.endswith('.ckpt') or args.save_to.endswith('.safetensors')):
+    raise Exception("The --save_to argument must be specified and must be a .ckpt or .safetensors file.")
 
+    
   def str_to_dtype(p):
     if p == 'float':
       return torch.float