From 84dd7e8e2495c4fc2997e97f8267aa831eb90d11 Mon Sep 17 00:00:00 2001
From: AUTOMATIC <16777216c@gmail.com>
Date: Mon, 2 Jan 2023 20:30:02 +0300
Subject: [PATCH] error out with a readable message in chwewckpoint merger for
 incompatible tensor shapes (ie when trying to merge SD1.5 with SD2.0)

---
 modules/extras.py | 2 ++
 modules/ui.py     | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/modules/extras.py b/modules/extras.py
index 68939dea8..5e2702508 100644
--- a/modules/extras.py
+++ b/modules/extras.py
@@ -303,6 +303,8 @@ def run_modelmerger(primary_model_name, secondary_model_name, tertiary_model_nam
                 theta_0[key][:, 0:4, :, :] = theta_func2(a[:, 0:4, :, :], b, multiplier)
                 result_is_inpainting_model = True
             else:
+                assert a.shape == b.shape, f'Incompatible shapes for layer {key}: A is {a.shape}, and B is {b.shape}'
+
                 theta_0[key] = theta_func2(a, b, multiplier)
 
             if save_as_half:
diff --git a/modules/ui.py b/modules/ui.py
index 27cd9ddd3..67a51888b 100644
--- a/modules/ui.py
+++ b/modules/ui.py
@@ -1663,7 +1663,7 @@ def create_ui():
                 print("Error loading/saving model file:", file=sys.stderr)
                 print(traceback.format_exc(), file=sys.stderr)
                 modules.sd_models.list_models()  # to remove the potentially missing models from the list
-                return ["Error loading/saving model file. It doesn't exist or the name contains illegal characters"] + [gr.Dropdown.update(choices=modules.sd_models.checkpoint_tiles()) for _ in range(3)]
+                return [f"Error merging checkpoints: {e}"] + [gr.Dropdown.update(choices=modules.sd_models.checkpoint_tiles()) for _ in range(4)]
             return results
 
         modelmerger_merge.click(
-- 
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