diff --git a/src/nodes/helpers.py b/src/nodes/helpers.py
index 3395e79..8843821 100644
--- a/src/nodes/helpers.py
+++ b/src/nodes/helpers.py
@@ -140,6 +140,8 @@ def load_image_wrapper(file_name, embed_transparency, disp_name=None, show_previ
 
 def save_image(images, filenames, prompt=None, extra_pnginfo=None, compress_level=4):
     if isinstance(filenames, str):
+        if not filenames:
+            raise ValueError("You must provide a file name")
         filenames = [filenames]
     B = images.shape[0]
     if len(filenames) != B:
diff --git a/src/nodes/nodes_img.py b/src/nodes/nodes_img.py
index 18be93e..b8f93ed 100644
--- a/src/nodes/nodes_img.py
+++ b/src/nodes/nodes_img.py
@@ -307,7 +307,7 @@ class ImageSave:
         return {
             "required": {
                 "image": ("IMAGE", {"tooltip": "The images to save."}),
-                "filename": ("STRING", {"default": "ComfyUI", "tooltip": "The file name for the image"})
+                "filename": ("STRING", {"default": "", "tooltip": "The file name for the image"})
             },
             "hidden": {
                 "prompt": "PROMPT", "extra_pnginfo": "EXTRA_PNGINFO"
@@ -329,6 +329,31 @@ class ImageSave:
         return ()
 
 
+class MaskSave:
+    @classmethod
+    def INPUT_TYPES(s):
+        return {
+            "required": {
+                "mask": ("MASK", {"tooltip": "The mask to save."}),
+                "filename": ("STRING", {"default": "", "tooltip": "The file name for the image"})
+            },
+        }
+
+    RETURN_TYPES = ()
+    FUNCTION = "execute"
+
+    OUTPUT_NODE = True
+
+    CATEGORY = BASE_CATEGORY + "/" + IO_CATEGORY
+    DESCRIPTION = ("Saves a mask to an arbitrary path")
+    UNIQUE_NAME = "SET_MaskSave"
+    DISPLAY_NAME = "Save Mask to Path"
+
+    def execute(self, mask, filename):
+        save_image(mask, filename)
+        return ()
+
+
 class ImageDataset:
     """
     A ComfyUI node to prepare lists of images for validation tasks,