diff --git a/app/__init__.py b/app/__init__.py
index 7521520e0..76760bd79 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -10,6 +10,7 @@ import traceback
 
 import logging
 from logging.handlers import SMTPHandler, WatchedFileHandler
+from threading import Thread
 
 from flask import current_app, g, request
 from flask import Flask
@@ -27,6 +28,7 @@ import sqlalchemy
 
 from app.scodoc.sco_exceptions import (
     AccessDenied,
+    ScoBugCatcher,
     ScoGenError,
     ScoValueError,
     APIInvalidParams,
@@ -77,6 +79,28 @@ def internal_server_error(exc):
     )
 
 
+def handle_sco_bug(exc):
+    """Un bug, en général rare, sur lequel les dev cherchent des
+    informations pour le corriger.
+    """
+    Thread(
+        target=_async_dump, args=(current_app._get_current_object(), request.url)
+    ).start()
+
+    return internal_server_error(exc)
+
+
+def _async_dump(app, request_url: str):
+    from app.scodoc.sco_dump_db import sco_dump_and_send_db
+
+    with app.app_context():
+        ndb.open_db_connection()
+        try:
+            sco_dump_and_send_db("ScoBugCatcher", request_url=request_url)
+        except ScoValueError:
+            pass
+
+
 def handle_invalid_usage(error):
     response = jsonify(error.to_dict())
     response.status_code = error.status_code
@@ -196,7 +220,7 @@ def create_app(config_class=DevConfig):
 
     app.register_error_handler(ScoGenError, handle_sco_value_error)
     app.register_error_handler(ScoValueError, handle_sco_value_error)
-
+    app.register_error_handler(ScoBugCatcher, handle_sco_bug)
     app.register_error_handler(AccessDenied, handle_access_denied)
     app.register_error_handler(500, internal_server_error)
     app.register_error_handler(503, postgresql_server_error)
diff --git a/app/scodoc/sco_bulletins_standard.py b/app/scodoc/sco_bulletins_standard.py
index f1b2b7cc7..e42a38847 100644
--- a/app/scodoc/sco_bulletins_standard.py
+++ b/app/scodoc/sco_bulletins_standard.py
@@ -49,6 +49,7 @@ Balises img: actuellement interdites.
 from reportlab.platypus import KeepTogether, Paragraph, Spacer, Table
 from reportlab.lib.units import cm, mm
 from reportlab.lib.colors import Color, blue
+from app.scodoc.sco_exceptions import ScoBugCatcher
 
 import app.scodoc.sco_utils as scu
 from app.scodoc.sco_pdf import SU
@@ -416,7 +417,11 @@ class BulletinGeneratorStandard(sco_bulletins_generator.BulletinGenerator):
         # Chaque UE:
         for ue in I["ues"]:
             ue_type = None
-            coef_ue = ue["coef_ue_txt"] if prefs["bul_show_ue_coef"] else ""
+            try:
+                coef_ue = ue["coef_ue_txt"] if prefs["bul_show_ue_coef"] else ""
+            except TypeError as exc:
+                raise ScoBugCatcher(f"ue={ue!r}") from exc
+
             ue_descr = ue["ue_descr_txt"]
             rowstyle = ""
             plusminus = minuslink  #
diff --git a/app/scodoc/sco_dump_db.py b/app/scodoc/sco_dump_db.py
index 190cec961..fd0b15c0d 100644
--- a/app/scodoc/sco_dump_db.py
+++ b/app/scodoc/sco_dump_db.py
@@ -51,14 +51,12 @@ import fcntl
 import subprocess
 import requests
 
-from flask import flash, request
+from flask import g, request
 from flask_login import current_user
 
 import app.scodoc.notesdb as ndb
 import app.scodoc.sco_utils as scu
 from app import log
-from app.scodoc import html_sco_header
-from app.scodoc import sco_preferences
 from app.scodoc import sco_users
 import sco_version
 from app.scodoc.sco_exceptions import ScoValueError
@@ -68,8 +66,7 @@ SCO_DUMP_LOCK = "/tmp/scodump.lock"
 
 def sco_dump_and_send_db(message: str = "", request_url: str = ""):
     """Dump base de données et l'envoie anonymisée pour debug"""
-    H = [html_sco_header.sco_header(page_title="Assistance technique")]
-    # get currect (dept) DB name:
+    # get current (dept) DB name:
     cursor = ndb.SimpleQuery("SELECT current_database()", {})
     db_name = cursor.fetchone()[0]
     ano_db_name = "ANO" + db_name
@@ -96,27 +93,7 @@ def sco_dump_and_send_db(message: str = "", request_url: str = ""):
 
         # Send
         r = _send_db(ano_db_name, message, request_url)
-        if (
-            r.status_code
-            == requests.codes.INSUFFICIENT_STORAGE  # pylint: disable=no-member
-        ):
-            H.append(
-                """<p class="warning">
-            Erreur: espace serveur trop plein.
-            Merci de contacter <a href="mailto:{0}">{0}</a></p>""".format(
-                    scu.SCO_DEV_MAIL
-                )
-            )
-        elif r.status_code == requests.codes.OK:  # pylint: disable=no-member
-            H.append("""<p>Opération effectuée.</p>""")
-        else:
-            H.append(
-                """<p class="warning">
-            Erreur: code <tt>{0} {1}</tt>
-            Merci de contacter <a href="mailto:{2}">{2}</a></p>""".format(
-                    r.status_code, r.reason, scu.SCO_DEV_MAIL
-                )
-            )
+        code = r.status_code
 
     finally:
         # Drop anonymized database
@@ -125,8 +102,8 @@ def sco_dump_and_send_db(message: str = "", request_url: str = ""):
         fcntl.flock(x, fcntl.LOCK_UN)
 
     log("sco_dump_and_send_db: done.")
-    flash("Données envoyées au serveur d'assistance")
-    return "\n".join(H) + html_sco_header.sco_footer()
+
+    return code
 
 
 def _duplicate_db(db_name, ano_db_name):
@@ -195,7 +172,7 @@ def _send_db(ano_db_name: str, message: str = "", request_url: str = ""):
             scu.SCO_DUMP_UP_URL,
             files=files,
             data={
-                "dept_name": sco_preferences.get_preference("DeptName"),
+                "dept_name": getattr(g, "scodoc_dept", "-"),
                 "message": message or "",
                 "request_url": request_url or request.url,
                 "serial": _get_scodoc_serial(),
diff --git a/app/scodoc/sco_exceptions.py b/app/scodoc/sco_exceptions.py
index 394dbf1e5..35d2d9d6e 100644
--- a/app/scodoc/sco_exceptions.py
+++ b/app/scodoc/sco_exceptions.py
@@ -47,9 +47,12 @@ class ScoValueError(ScoException):
         self.dest_url = dest_url
 
 
+class ScoBugCatcher(ScoException):
+    "bug avec enquete en cours"
+
+
 class NoteProcessError(ScoValueError):
     "Valeurs notes invalides"
-    pass
 
 
 class InvalidEtudId(NoteProcessError):
diff --git a/app/views/notes.py b/app/views/notes.py
index c8587c4fb..7a9e50673 100644
--- a/app/views/notes.py
+++ b/app/views/notes.py
@@ -73,6 +73,7 @@ from app.scodoc.scolog import logdb
 
 from app.scodoc.sco_exceptions import (
     AccessDenied,
+    ScoBugCatcher,
     ScoException,
     ScoValueError,
     ScoInvalidIdType,
diff --git a/app/views/scolar.py b/app/views/scolar.py
index 67cb7b7b6..a25994bd9 100644
--- a/app/views/scolar.py
+++ b/app/views/scolar.py
@@ -30,7 +30,7 @@ issu de ScoDoc7 / ZScolar.py
 
 Emmanuel Viennet, 2021
 """
-import os
+import requests
 import time
 
 import flask
@@ -2198,4 +2198,24 @@ def stat_bac(formsemestre_id):
 @scodoc7func
 def sco_dump_and_send_db(message="", request_url=""):
     "Send anonymized data to supervision"
-    return sco_dump_db.sco_dump_and_send_db(message, request_url)
+
+    status_code = sco_dump_db.sco_dump_and_send_db(message, request_url)
+    H = [html_sco_header.sco_header(page_title="Assistance technique")]
+    if status_code == requests.codes.INSUFFICIENT_STORAGE:  # pylint: disable=no-member
+        H.append(
+            """<p class="warning">
+        Erreur: espace serveur trop plein.
+        Merci de contacter <a href="mailto:{0}">{0}</a></p>""".format(
+                scu.SCO_DEV_MAIL
+            )
+        )
+    elif status_code == requests.codes.OK:  # pylint: disable=no-member
+        H.append("""<p>Opération effectuée.</p>""")
+    else:
+        H.append(
+            f"""<p class="warning">
+        Erreur: code <tt>{status_code}</tt>
+        Merci de contacter <a href="mailto:{scu.SCO_DEV_MAIL}">{scu.SCO_DEV_MAIL}</a></p>"""
+        )
+    flash("Données envoyées au serveur d'assistance")
+    return "\n".join(H) + html_sco_header.sco_footer()
diff --git a/sco_version.py b/sco_version.py
index 0cedeb3dc..547202122 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.1.82"
+SCOVERSION = "9.1.83"
 
 SCONAME = "ScoDoc"