diff --git a/apps/treasury/admin.py b/apps/treasury/admin.py
index 2d2fbbef..fe9d3725 100644
--- a/apps/treasury/admin.py
+++ b/apps/treasury/admin.py
@@ -3,7 +3,7 @@
 
 from django.contrib import admin
 
-from treasury.models import Billing, Product
+from .models import Billing, Product
 
 
 @admin.register(Billing)
diff --git a/apps/treasury/apps.py b/apps/treasury/apps.py
index 5f7f6dc9..96bab8a0 100644
--- a/apps/treasury/apps.py
+++ b/apps/treasury/apps.py
@@ -2,7 +2,6 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from django.apps import AppConfig
-from django.db.models.signals import pre_save, post_save, post_delete
 from django.utils.translation import gettext_lazy as _
 
 
diff --git a/apps/treasury/forms.py b/apps/treasury/forms.py
index acf2eb7c..e8697fda 100644
--- a/apps/treasury/forms.py
+++ b/apps/treasury/forms.py
@@ -20,10 +20,11 @@ ProductFormSet = forms.inlineformset_factory(
     extra=1,
 )
 
+
 class ProductFormSetHelper(FormHelper):
     def __init__(self, form=None):
         super().__init__(form)
         self.form_tag = False
         self.form_method = 'POST'
         self.form_class = 'form-inline'
-        self.template = 'bootstrap4/table_inline_formset.html'
\ No newline at end of file
+        self.template = 'bootstrap4/table_inline_formset.html'
diff --git a/apps/treasury/tables.py b/apps/treasury/tables.py
index acbcd606..c651d7f5 100644
--- a/apps/treasury/tables.py
+++ b/apps/treasury/tables.py
@@ -1,8 +1,8 @@
 # Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from django.utils.translation import gettext_lazy as _
 import django_tables2 as tables
+from django.utils.translation import gettext_lazy as _
 from django_tables2 import A
 
 from .models import Billing
@@ -11,17 +11,17 @@ from .models import Billing
 class BillingTable(tables.Table):
     id = tables.LinkColumn("treasury:billing_update",
                            args=[A("pk")],
-                           text=lambda record: _("Billing #{:d}").format(record.id),)
+                           text=lambda record: _("Billing #{:d}").format(record.id), )
 
     billing = tables.LinkColumn("treasury:billing_render",
-                               verbose_name=_("Billing"),
-                               args=[A("pk")],
-                               accessor="pk",
-                               text="",
-                               attrs={
-                                   'a': {'class': 'fa fa-file-pdf-o'},
-                                   'td': {'data-turbolinks': 'false'}
-                               })
+                                verbose_name=_("Billing"),
+                                args=[A("pk")],
+                                accessor="pk",
+                                text="",
+                                attrs={
+                                    'a': {'class': 'fa fa-file-pdf-o'},
+                                    'td': {'data-turbolinks': 'false'}
+                                })
 
     class Meta:
         attrs = {
@@ -29,4 +29,4 @@ class BillingTable(tables.Table):
         }
         model = Billing
         template_name = 'django_tables2/bootstrap4.html'
-        fields = ('id', 'name', 'subject', 'acquitted', 'billing', )
+        fields = ('id', 'name', 'subject', 'acquitted', 'billing',)
diff --git a/apps/treasury/views.py b/apps/treasury/views.py
index 1fb4bcf0..ed0065c7 100644
--- a/apps/treasury/views.py
+++ b/apps/treasury/views.py
@@ -15,7 +15,6 @@ from django.urls import reverse_lazy
 from django.views.generic import CreateView, UpdateView
 from django.views.generic.base import View
 from django_tables2 import SingleTableView
-
 from note_kfet.settings.base import BASE_DIR
 
 from .forms import BillingForm, ProductFormSet, ProductFormSetHelper
@@ -130,30 +129,39 @@ class BillingRenderView(LoginRequiredMixin, View):
             pass
         tmp_dir = mkdtemp(prefix=BASE_DIR + "/tmp/")
 
-        with open("{}/billing-{:d}.tex".format(tmp_dir, pk), "wb") as f:
-            f.write(tex.encode("UTF-8"))
-        del tex
+        try:
+            with open("{}/billing-{:d}.tex".format(tmp_dir, pk), "wb") as f:
+                f.write(tex.encode("UTF-8"))
+            del tex
 
-        error = subprocess.Popen(
-            ["pdflatex", "billing-{}.tex".format(pk)],
-            cwd=tmp_dir,
-            stdin=open(os.devnull, "r"),
-            stderr=open(os.devnull, "wb"),
-            stdout=open(os.devnull, "wb")
-        ).wait()
+            error = subprocess.Popen(
+                ["pdflatex", "billing-{}.tex".format(pk)],
+                cwd=tmp_dir,
+                stdin=open(os.devnull, "r"),
+                stderr=open(os.devnull, "wb"),
+                stdout=open(os.devnull, "wb")
+            ).wait()
 
-        error = subprocess.Popen(
-            ["pdflatex", "billing-{}.tex".format(pk)],
-            cwd=tmp_dir,
-            stdin=open(os.devnull, "r"),
-            stderr=open(os.devnull, "wb"),
-            stdout=open(os.devnull, "wb")
-        ).wait()
+            if error:
+                raise IOError("An error attempted while generating a billing:", error)
 
-        pdf = open("{}/billing-{}.pdf".format(tmp_dir, pk), 'rb').read()
-        shutil.rmtree(tmp_dir)
+            error = subprocess.Popen(
+                ["pdflatex", "billing-{}.tex".format(pk)],
+                cwd=tmp_dir,
+                stdin=open(os.devnull, "r"),
+                stderr=open(os.devnull, "wb"),
+                stdout=open(os.devnull, "wb")
+            ).wait()
 
-        response = HttpResponse(pdf, content_type="application/pdf")
-        response['Content-Disposition'] = "inline;filename=billing-{:d}.pdf".format(pk)
+            if error:
+                raise IOError("An error attempted while generating a billing:", error)
+
+            pdf = open("{}/billing-{}.pdf".format(tmp_dir, pk), 'rb').read()
+            response = HttpResponse(pdf, content_type="application/pdf")
+            response['Content-Disposition'] = "inline;filename=billing-{:d}.pdf".format(pk)
+        except IOError as e:
+            raise e
+        finally:
+            shutil.rmtree(tmp_dir)
 
         return response
diff --git a/tox.ini b/tox.ini
index 2217b6bf..decdae9c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -32,7 +32,7 @@ deps =
     pep8-naming
     pyflakes
 commands =
-    flake8 apps/activity apps/api apps/logs apps/member apps/note
+    flake8 apps/activity apps/api apps/logs apps/member apps/note apps/treasury
 
 [flake8]
 # Ignore too many errors, should be reduced in the future