diff --git a/CHANGELOG.md b/CHANGELOG.md
index 19ed1679..e2493d1e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,15 @@ adhérents ni des cotisations.
 
 ## Version ??? - ??/??/????
 
+## Version 0.13 - 19/02/2023
+
+### K-Fêt
+
+- Rajoute la valeur des inventaires
+- Résout les problèmes de négatif ne disparaissant pas
+- Affiche son surnom s'il y en a un
+- Bugfixes
+
 ## Version 0.12.1 - 03/10/2022
 
 ### K-Fêt
diff --git a/kfet/management/commands/sendrappelsnegatifs.py b/kfet/management/commands/sendrappelsnegatifs.py
index 58c47d4e..4e2f67c3 100644
--- a/kfet/management/commands/sendrappelsnegatifs.py
+++ b/kfet/management/commands/sendrappelsnegatifs.py
@@ -19,23 +19,31 @@ class Command(BaseCommand):
 
     def handle(self, *args, **options):
         now = timezone.now()
+
+        # Le premier mail est envoyé après 24h de négatif, puis toutes les semaines
         first_delay = timedelta(days=1)
         periodic_delay = timedelta(weeks=1)
-        accounts_first_mail = (
-            AccountNegative.objects.filter(start__lt=now - first_delay)
-            .filter(last_rappel__isnull=True)
-            .all()
+
+        # On n'envoie des mails qu'aux comptes qui ont un négatif vraiment actif
+        # et dont la balance est négative
+        account_negatives = AccountNegative.objects.filter(
+            account__balance__lt=0
+        ).exclude(end__lte=now)
+
+        accounts_first_mail = account_negatives.filter(
+            start__lt=now - first_delay, last_rappel__isnull=True
         )
-        accounts_periodic_mail = (
-            AccountNegative.objects.filter(last_rappel__isnull=False)
-            .filter(last_rappel__lt=now - periodic_delay)
-            .all()
+        accounts_periodic_mail = account_negatives.filter(
+            last_rappel__lt=now - periodic_delay
         )
+
         for neg in accounts_first_mail:
             neg.send_rappel()
             self.stdout.write(f"Mail de rappel pour {neg.account} envoyé avec succès.")
+
         for neg in accounts_periodic_mail:
             neg.send_rappel()
             self.stdout.write("Mail de rappel pour {neg.account} envoyé avec succès.")
-        if (not accounts_first_mail) and (not accounts_periodic_mail):
+
+        if not (accounts_first_mail.exists() or accounts_periodic_mail.exists()):
             self.stdout.write("Aucun mail à envoyer.")
diff --git a/kfet/models.py b/kfet/models.py
index 7a0ec777..a71b53cd 100644
--- a/kfet/models.py
+++ b/kfet/models.py
@@ -260,8 +260,10 @@ class Account(models.Model):
         elif hasattr(self, "negative"):
             if self.negative.end is None:
                 self.negative.end = timezone.now()
+                self.negative.save()
             elif timezone.now() > self.negative.end + kfet_config.cancel_duration:
                 # Idem: on supprime le négatif après une légère période
+                # Nécessaire pour se souvenir du négatif après une charge annulée
                 self.negative.delete()
 
     class UserHasAccount(Exception):
diff --git a/kfet/static/kfet/css/base/misc.css b/kfet/static/kfet/css/base/misc.css
index fab1a33a..97c0ee7e 100644
--- a/kfet/static/kfet/css/base/misc.css
+++ b/kfet/static/kfet/css/base/misc.css
@@ -61,7 +61,7 @@ ul {
 }
 
 .table td.no-padding {
-    padding:0;
+    padding:0 !important;
 }
 
 .table thead {
diff --git a/kfet/static/kfet/js/history.js b/kfet/static/kfet/js/history.js
index 4c2a2664..57829a10 100644
--- a/kfet/static/kfet/js/history.js
+++ b/kfet/static/kfet/js/history.js
@@ -248,7 +248,7 @@ function KHistory(options = {}) {
                 that.cancel_entry(entry);
             }
             if (type == "operation") {
-                for (let opegroup of data["opegroups_to_update"]) {
+                for (let opegroup of (data["opegroups_to_update"] || [])) {
                     that.update_opegroup(opegroup)
                 }
             }
diff --git a/kfet/templates/kfet/inventory_read.html b/kfet/templates/kfet/inventory_read.html
index 9a9275f8..3b308377 100644
--- a/kfet/templates/kfet/inventory_read.html
+++ b/kfet/templates/kfet/inventory_read.html
@@ -37,6 +37,12 @@
 
 {% block main %}
 
+<div class="messages">
+  <div class="alert alert-info">
+    Les valeurs de stock sont calculées sur la base du prix actuel des articles.
+  </div>
+</div>
+
 <div class="table-responsive">
   <table
       class="table table-condensed table-hover table-striped sortable"
@@ -50,28 +56,36 @@
         <td>Erreur</td>
       </tr>
     </thead>
-    {% regroup inventoryarts by article.category as category_list %}
+    {% regroup inventoryarts by article.category.name as category_list %}
     {% for category in category_list %}
       <tbody class="tablesorter-no-sort">
         <tr class="section">
-          <td colspan="4">{{ category.grouper.name }}</td>
+          <td colspan="4">{{ category.grouper }}</td>
         </tr>
       </tbody>
       <tbody>
         {% for inventoryart in category.list %}
           <tr>
             <td>
-              <a href="{% url "kfet.article.read" inventoryart.article.id %}">
+              <a href="{% url "kfet.article.read" inventoryart.article_id %}">
                 {{ inventoryart.article.name }}
               </a>
             </td>
             <td>{{ inventoryart.stock_old }}</td>
             <td>{{ inventoryart.stock_new }}</td>
-            <td>{{ inventoryart.stock_error }}</td>
+            <td>{{ inventoryart.stock_error }} / {{ inventoryart.amount_error|floatformat:"-2" }} €</td>
           </tr>
         {% endfor %}
       </tbody>
     {% endfor %}
+      <tbody>
+        <tr class="section">
+          <td>Valeurs totales</td>
+          <td>{{ total_amount_old|floatformat:"-2" }} €</td>
+          <td>{{ total_amount_new|floatformat:"-2" }} €</td>
+          <td>{{ total_amount_error|floatformat:"-2" }} €</td>
+        </tr>
+      </tbody>
   </table>
 </div>
 
diff --git a/kfet/templates/kfet/left_account.html b/kfet/templates/kfet/left_account.html
index aa22cb03..eee35ca2 100644
--- a/kfet/templates/kfet/left_account.html
+++ b/kfet/templates/kfet/left_account.html
@@ -31,9 +31,7 @@
   <div class="text">
     <h4>{{ account.name|title }}</h4>
     <ul class="list-unstyled">
-      {% if perms.kfet.is_team %}
       <li>{{ account.nickname }}</li>
-      {% endif %}
       <li>{{ account.email|default:"Pas d'email!" }}</li>
       <li>
         {% if account.promo %}
@@ -53,7 +51,7 @@
     </ul>
   </div>
 
-  {% if account.negative %}
+  {% if account.negative and account.balance_ukf < 0 %}
   <div class="text">
     <h4>Négatif</h4>
     <ul class="list-unstyled">
diff --git a/kfet/views.py b/kfet/views.py
index 569e42a5..15bde0f7 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -14,7 +14,18 @@ from django.contrib.auth.models import Permission, User
 from django.contrib.messages.views import SuccessMessageMixin
 from django.core.exceptions import SuspiciousOperation
 from django.db import transaction
-from django.db.models import Count, F, Max, OuterRef, Prefetch, Q, Subquery, Sum
+from django.db.models import (
+    Count,
+    DecimalField,
+    ExpressionWrapper,
+    F,
+    Max,
+    OuterRef,
+    Prefetch,
+    Q,
+    Subquery,
+    Sum,
+)
 from django.forms import ValidationError, formset_factory
 from django.http import (
     Http404,
@@ -2013,12 +2024,34 @@ class InventoryRead(DetailView):
 
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
-        inventoryarticles = (
+        output_field = DecimalField(max_digits=10, decimal_places=2, default=0)
+        inventory_articles = (
             InventoryArticle.objects.select_related("article", "article__category")
             .filter(inventory=self.object)
+            .annotate(
+                amount_error=ExpressionWrapper(
+                    F("stock_error") * F("article__price"), output_field=output_field
+                )
+            )
             .order_by("article__category__name", "article__name")
         )
-        context["inventoryarts"] = inventoryarticles
+        context["inventoryarts"] = inventory_articles
+        stats = inventory_articles.aggregate(
+            new=ExpressionWrapper(
+                Sum(F("stock_new") * F("article__price")), output_field=output_field
+            ),
+            error=Sum("amount_error"),
+            old=ExpressionWrapper(
+                Sum(F("stock_old") * F("article__price")), output_field=output_field
+            ),
+        )
+        context.update(
+            {
+                "total_amount_old": stats["old"],
+                "total_amount_new": stats["new"],
+                "total_amount_error": stats["error"],
+            }
+        )
         return context