diff --git a/zds/forum/views.py b/zds/forum/views.py
index 0db52095d7..4615d1eadf 100644
--- a/zds/forum/views.py
+++ b/zds/forum/views.py
@@ -151,9 +151,13 @@ def topic(request, topic_pk, topic_slug):
     # The category list is needed to move threads
 
     categories = Category.objects.all()
-    try:
-        page_nbr = int(request.GET["page"])
-    except KeyError:
+    if "page" in request.GET:
+        try:
+            page_nbr = int(request.GET["page"])
+        except:
+            # problem in variable format
+            raise Http404
+    else:
         page_nbr = 1
     try:
         posts = paginator.page(page_nbr)
@@ -233,7 +237,8 @@ def new(request):
 
     try:
         forum_pk = request.GET["forum"]
-    except KeyError:
+    except:
+        # problem in variable format
         raise Http404
     forum = get_object_or_404(Forum, pk=forum_pk)
     if not forum.can_read(request.user):
@@ -344,7 +349,8 @@ def move_topic(request):
         raise PermissionDenied
     try:
         topic_pk = request.GET["sujet"]
-    except KeyError:
+    except:
+        # problem in variable format
         raise Http404
     forum = get_object_or_404(Forum, pk=request.POST["forum"])
     if not forum.can_read(request.user):
@@ -374,12 +380,18 @@ def edit(request):
 
     try:
         topic_pk = request.POST["topic"]
-    except KeyError:
+    except:
+        # problem in variable format
         raise Http404
-    try:
-        page = int(request.POST["page"])
-    except KeyError:
+    if "page" in request.POST:
+        try:
+            page = int(request.POST["page"])
+        except:
+            #problem in variable format
+            raise Http404
+    else:
         page = 1
+
     data = request.POST
     resp = {}
     g_topic = get_object_or_404(Topic, pk=topic_pk)
@@ -409,7 +421,8 @@ def edit(request):
         if "move" in data:
             try:
                 forum_pk = int(request.POST["move_target"])
-            except KeyError:
+            except:
+                # problem in variable format
                 raise Http404
             forum = get_object_or_404(Forum, pk=forum_pk)
             g_topic.forum = forum
@@ -432,7 +445,8 @@ def answer(request):
 
     try:
         topic_pk = request.GET["sujet"]
-    except KeyError:
+    except:
+        # problem in variable format
         raise Http404
 
     # Retrieve current topic.
@@ -589,7 +603,8 @@ def edit_post(request):
 
     try:
         post_pk = request.GET["message"]
-    except KeyError:
+    except:
+        # problem in variable format
         raise Http404
     post = get_object_or_404(Post, pk=post_pk)
     if not post.topic.forum.can_read(request.user):
@@ -715,7 +730,8 @@ def useful_post(request):
 
     try:
         post_pk = request.GET["message"]
-    except KeyError:
+    except:
+        # problem in variable format
         raise Http404
     post = get_object_or_404(Post, pk=post_pk)
 
@@ -741,7 +757,8 @@ def unread_post(request):
 
     try:
         post_pk = request.GET["message"]
-    except KeyError:
+    except:
+        # problem in variable format
         raise Http404
     post = get_object_or_404(Post, pk=post_pk)
 
@@ -775,7 +792,8 @@ def like_post(request):
 
     try:
         post_pk = request.GET["message"]
-    except KeyError:
+    except:
+        # problem in variable format
         raise Http404
     resp = {}
     post = get_object_or_404(Post, pk=post_pk)
@@ -822,7 +840,8 @@ def dislike_post(request):
 
     try:
         post_pk = request.GET["message"]
-    except KeyError:
+    except:
+        # problem in variable format
         raise Http404
     resp = {}
     post = get_object_or_404(Post, pk=post_pk)