diff --git a/py/nodes/UpscalerRefiner/McBoaty_v5.py b/py/nodes/UpscalerRefiner/McBoaty_v5.py
index 13558af..075d0e3 100644
--- a/py/nodes/UpscalerRefiner/McBoaty_v5.py
+++ b/py/nodes/UpscalerRefiner/McBoaty_v5.py
@@ -510,10 +510,10 @@ def is_valid_index(index, max = 64):
         def to_computer_index(human_index):
             return human_index - 1
 
-        _tiles_to_process = None
+        _tiles_to_process = []
         
         if tiles_to_process == '':
-            return []
+            return _tiles_to_process
 
         indexes = tiles_to_process.split(',')
         
@@ -525,6 +525,7 @@ def to_computer_index(human_index):
                 if is_valid_index(start, max) and is_valid_index(end, max):
                     _tiles_to_process.extend(range(to_computer_index(start), to_computer_index(end) + 1))
                 else:
+                    _tiles_to_process.append(-1)
                     log(f"tiles_to_process is not in valid format '{tiles_to_process}' - Allowed formats : indexes from 1 to {max} or any range like 1-{max}", None, COLORS['YELLOW'], f"Node {self.INFO.id}")
             else:
                 # Single index
@@ -533,13 +534,17 @@ def to_computer_index(human_index):
                     if is_valid_index(index, max):
                         _tiles_to_process.append(to_computer_index(index))
                     else:
+                        _tiles_to_process.append(-1)
                         log(f"tiles_to_process is not in valid format '{tiles_to_process}' - Allowed formats : indexes from 1 to {max} or any range like 1-{max}", None, COLORS['YELLOW'], f"Node {self.INFO.id}")
                 except ValueError:
+                    _tiles_to_process.append(-1)
                     # Ignore non-integer values
                     pass
 
         # Remove duplicates and sort
         _tiles_to_process = sorted(set(_tiles_to_process))
+        if -1 in _tiles_to_process:
+            _tiles_to_process = [-1]
 
         return _tiles_to_process
             
@@ -622,6 +627,10 @@ def refine(self, image, iteration):
                     output = (nodes.VAEDecode().decode(self.KSAMPLER.vae, latent_output)[0].unsqueeze(0))[0]            
             output_images.append(output)
 
+        if len(self.PARAMS.tiles_to_process) > 0 and len(self.OUTPUTS.grid_tiles_to_process) == 0:
+            log("!!! WARNING !!! you are processing specific tiles without a fully refined image, we suggest to pass through a full refiner first", None, COLORS['YELLOW'], f"Node {self.INFO.id} {iteration}")
+            self.OUTPUTS.grid_tiles_to_process = self.OUTPUTS.grid_images
+
         if len(self.PARAMS.tiles_to_process) > 0:
             _grid_tiles_to_process = list(self.OUTPUTS.grid_tiles_to_process)
             for index, output_image in enumerate(output_images):
diff --git a/py/utils/version.py b/py/utils/version.py
index e774689..9e1bd86 100644
--- a/py/utils/version.py
+++ b/py/utils/version.py
@@ -3,4 +3,4 @@
 #
 ###
 
-VERSION = "5.0.3"
+VERSION = "5.0.4"
diff --git a/pyproject.toml b/pyproject.toml
index a1f801d..894c925 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [project]
 name = "comfyui_marascott_nodes"
 description = "A set of nodes including a universal bus, an Inpainting By Mask and a large Upscaler/Refiner"
-version = "5.0.3"
+version = "5.0.4"
 license = "LICENSE"
 dependencies = ["blend_modes", "numba", "color-matcher", "groq", "opencv-python"]