diff --git a/app/comp/moy_ue.py b/app/comp/moy_ue.py
index 5d6e27b4..30d8466b 100644
--- a/app/comp/moy_ue.py
+++ b/app/comp/moy_ue.py
@@ -30,6 +30,7 @@
 import numpy as np
 import pandas as pd
 
+import app
 from app import db
 from app import models
 from app.models import (
@@ -167,8 +168,14 @@ def notes_sem_assemble_cube(modimpls_notes: list[pd.DataFrame]) -> np.ndarray:
     """
     assert len(modimpls_notes)
     modimpls_notes_arr = [df.values for df in modimpls_notes]
-    modimpls_notes = np.stack(modimpls_notes_arr)
-    # passe de (mod x etud x ue) à (etud x mod x ue)
+    try:
+        modimpls_notes = np.stack(modimpls_notes_arr)
+        # passe de (mod x etud x ue) à (etud x mod x ue)
+    except ValueError:
+        app.critical_error(
+            f"""notes_sem_assemble_cube: shapes {
+            ", ".join([x.shape for x in modimpls_notes_arr])}"""
+        )
     return modimpls_notes.swapaxes(0, 1)