diff --git a/ihatemoney/models.py b/ihatemoney/models.py
index 313090fc..af11da28 100644
--- a/ihatemoney/models.py
+++ b/ihatemoney/models.py
@@ -752,7 +752,8 @@ class Bill(db.Model):
         else:
             return 0
 
-    def involves_deactivated_members(self, project):
+    @property
+    def involves_deactivated_members(self):
         """Check whether the bill contains deactivated member.
         Return:
         True if it contains deactivated member,
@@ -762,8 +763,7 @@ class Bill(db.Model):
         bill_member_id_list = owers_id + [self.payer_id]
         deactivated_member_number = (
             Person.query.filter(Person.id.in_(bill_member_id_list))
-            .filter(Person.project_id == project.id)
-            .filter(Person.activated == False)
+            .filter(Person.activated.is_(False))
             .count()
         )
         return deactivated_member_number != 0
diff --git a/ihatemoney/templates/list_bills.html b/ihatemoney/templates/list_bills.html
index 79e25262..7f4350e8 100644
--- a/ihatemoney/templates/list_bills.html
+++ b/ihatemoney/templates/list_bills.html
@@ -148,10 +148,22 @@
                     </span>
                 </td>
                 <td class="bill-actions d-flex align-items-center">
-                    <a class="edit" href="{{ url_for(".edit_bill", bill_id=bill.id) }}" title="{{ _("edit") }}">{{ _('edit') }}</a>
+                    <a class="edit" href="{{ url_for(".edit_bill", bill_id=bill.id) }}" data-toggle="tooltip"
+                        {% if bill.involves_deactivated_members %}
+                            title="Cannot be edited as deactivated members involved"
+                        {% else %}
+                            title="Click to edit this bill"
+                        {% endif %}
+                    >{{ _('edit') }}</a>
                     <form class="delete-bill" action="{{ url_for(".delete_bill", bill_id=bill.id) }}" method="POST">
                         {{ csrf_form.csrf_token }}
-                        <button class="action delete" type="submit" title="{{ _("delete") }}"></button>
+                        <button class="action delete" type="submit" data-toggle="tooltip"
+                            {% if bill.involves_deactivated_members %}
+                                title="Cannot be deleted as deactivated members involved"
+                            {% else %}
+                                title="Click to delete this bill"
+                            {% endif %}
+                        ></button>
                     </form>
                     {% if bill.external_link %}
                     <a class="show" href="{{ bill.external_link }}" ref="noopener" target="_blank" title="{{ _("show") }}">{{ _('show') }} </a>
diff --git a/ihatemoney/web.py b/ihatemoney/web.py
index 58b0580f..d3706e40 100644
--- a/ihatemoney/web.py
+++ b/ihatemoney/web.py
@@ -801,11 +801,7 @@ def delete_bill(bill_id):
         return redirect(url_for(".list_bills"))
 
     # Check if the bill contains deactivated member. If yes, stop deleting.
-    if bill.involves_deactivated_members(g.project):
-        flash(
-            _("Deactivated users involved. This bill cannot be deleted."),
-            category="warning",
-        )
+    if bill.involves_deactivated_members:
         return redirect(url_for(".list_bills"))
 
     db.session.delete(bill)
@@ -823,11 +819,7 @@ def edit_bill(bill_id):
         raise NotFound()
 
     # Check if the bill contains deactivated member. If yes, stop editing.
-    if bill.involves_deactivated_members(g.project):
-        flash(
-            _("Deactivated users involved. This bill cannot be edited."),
-            category="warning",
-        )
+    if bill.involves_deactivated_members:
         return redirect(url_for(".list_bills"))
 
     form = get_billform_for(g.project, set_default=False)