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app.py

@@ -1758,8 +1758,15 @@ def _load_cluster_csv(model, min_val, threshold):
                         f"t={threshold}_ALL_FIELDS")
     for ext in (".csv.gz", ".csv"):
         path = base + ext
-        if os.path.isfile(path):
+        if not os.path.isfile(path):
+            continue
+        try:
             return pd.read_csv(path, compression="gzip" if ext == ".csv.gz" else None)
+        except Exception:
+            try:
+                return pd.read_csv(path)  # fallback: file may be plain CSV despite .gz extension
+            except Exception:
+                continue
     return None