diff --git a/app/scodoc/sco_bulletins_standard.py b/app/scodoc/sco_bulletins_standard.py
index 83b33a0e0..0039dba5e 100644
--- a/app/scodoc/sco_bulletins_standard.py
+++ b/app/scodoc/sco_bulletins_standard.py
@@ -46,16 +46,20 @@ de la forme %(XXX)s sont remplacées par la valeur de XXX, pour XXX dans:
 Balises img: actuellement interdites.
 
 """
-from flask import url_for, g
-
-from reportlab.platypus import KeepTogether, Paragraph, Spacer, Table
-from reportlab.lib.units import cm, mm
+from flask import g, url_for
 from reportlab.lib.colors import Color, blue
+from reportlab.lib.units import cm, mm
+from reportlab.platypus import KeepTogether, Paragraph, Spacer, Table
 
 import app.scodoc.sco_utils as scu
-from app.scodoc.sco_pdf import SU, make_paras
-from app.scodoc import sco_preferences
-from app.scodoc.sco_permissions import Permission
+from app.scodoc import (
+    gen_tables,
+    sco_bulletins_generator,
+    sco_bulletins_pdf,
+    sco_evaluations,
+    sco_groups,
+    sco_preferences,
+)
 from app.scodoc.codes_cursus import (
     UE_COLORS,
     UE_DEFAULT_COLOR,
@@ -63,17 +67,17 @@ from app.scodoc.codes_cursus import (
     UE_SPORT,
     UE_STANDARD,
 )
-from app.scodoc import sco_bulletins_generator
-from app.scodoc import sco_bulletins_pdf
-from app.scodoc import sco_groups
-from app.scodoc import sco_evaluations
-from app.scodoc import gen_tables
+from app.scodoc.sco_exceptions import ScoPDFFormatError
+from app.scodoc.sco_pdf import SU, make_paras
+from app.scodoc.sco_permissions import Permission
 
 
 # Important: Le nom de la classe ne doit pas changer (bien le choisir),
 # car il sera stocké en base de données (dans les préférences)
 class BulletinGeneratorStandard(sco_bulletins_generator.BulletinGenerator):
-    description = "standard ScoDoc (version 2011)"  # la description doit être courte: elle apparait dans le menu de paramètrage ScoDoc
+    "Les bulletins standards"
+    # la description doit être courte: elle apparait dans le menu de paramètrage ScoDoc
+    description = "standard ScoDoc (version 2011)"
     supported_formats = ["html", "pdf"]
 
     def bul_title_pdf(self) -> list:
@@ -158,31 +162,47 @@ class BulletinGeneratorStandard(sco_bulletins_generator.BulletinGenerator):
         H.append('<div class="bull_appreciations">')
         for app in self.infos["appreciations_list"]:
             if can_edit_app:
-                mlink = (
-                    '<a class="stdlink" href="appreciation_add_form?id=%s">modifier</a> <a class="stdlink" href="appreciation_add_form?id=%s&suppress=1">supprimer</a>'
-                    % (app["id"], app["id"])
-                )
+                mlink = f"""<a class="stdlink" href="{
+                        url_for('notes.appreciation_add_form', scodoc_dept=g.scodoc_dept, id=app['id'])
+                    }">modifier</a>
+                    <a class="stdlink" href="{
+                        url_for('notes.appreciation_add_form', scodoc_dept=g.scodoc_dept, id=app['id'], suppress=1)
+                    }">supprimer</a>"""
             else:
                 mlink = ""
             H.append(
-                '<p><span class="bull_appreciations_date">%s</span>%s<span class="bull_appreciations_link">%s</span></p>'
-                % (app["date"], app["comment"], mlink)
+                f"""<p><span class="bull_appreciations_date">{app["date"]}</span>{
+                    app["comment"]}<span class="bull_appreciations_link">{mlink}</span>
+                    </p>"""
             )
         if can_edit_app:
             H.append(
-                '<p><a class="stdlink" href="appreciation_add_form?etudid=%(etudid)s&formsemestre_id=%(formsemestre_id)s">Ajouter une appréciation</a></p>'
+                f"""<p><a class="stdlink" href="{
+                    url_for('notes.appreciation_add_form', scodoc_dept=g.scodoc_dept, 
+                            etudid=self.infos['etudid'],
+                            formsemestre_id=self.infos['formsemestre_id']
+                    )
+                    }">Ajouter une appréciation</a></p>"""
                 % self.infos
             )
         H.append("</div>")
         # Appréciations sur PDF:
         if self.infos.get("appreciations_list", False):
             story.append(Spacer(1, 3 * mm))
-            story.append(
-                Paragraph(
-                    SU("Appréciation : " + "\n".join(self.infos["appreciations_txt"])),
-                    self.CellStyle,
+            try:
+                story.append(
+                    Paragraph(
+                        SU(
+                            "Appréciation : "
+                            + "\n".join(self.infos["appreciations_txt"])
+                        ),
+                        self.CellStyle,
+                    )
                 )
-            )
+            except AttributeError as exc:
+                raise ScoPDFFormatError(
+                    "Appréciation invalide bloquant la génération du pdf"
+                ) from exc
 
         # ----- DECISION JURY
         if self.preferences["bul_show_decision"]:
diff --git a/app/scodoc/sco_pdf.py b/app/scodoc/sco_pdf.py
index 841f8b3fa..631d71b07 100755
--- a/app/scodoc/sco_pdf.py
+++ b/app/scodoc/sco_pdf.py
@@ -55,10 +55,10 @@ from reportlab.lib import styles
 
 from flask import g
 
+from app import log
+from app.scodoc.sco_exceptions import ScoGenError, ScoPDFFormatError, ScoValueError
 from app.scodoc import sco_utils as scu
 from app.scodoc.sco_utils import CONFIG
-from app import log
-from app.scodoc.sco_exceptions import ScoGenError, ScoValueError
 import sco_version
 
 PAGE_HEIGHT = defaultPageSize[1]
@@ -136,7 +136,10 @@ def make_paras(txt: str, style, suppress_empty=False) -> list[Paragraph]:
                     if m.group(1):  # non empty paragraph
                         r.append(para)
             paras = r
-        result = [Paragraph(SU(s), style) for s in paras]
+        try:
+            result = [Paragraph(SU(s), style) for s in paras]
+        except AttributeError as exc:
+            raise ScoPDFFormatError("PDF: paragraphe avec balisage invalide") from exc
     except OSError as e:
         msg = str(e)
         # If a file is missing, try to display the invalid name