diff --git a/registrasion/views.py b/registrasion/views.py
index 251f0fbad679137638d04808f578bdde4d74e4fa..1b0fe64655b38b3c65ef8eaecfa5e0215af34d54 100644
--- a/registrasion/views.py
+++ b/registrasion/views.py
@@ -52,6 +52,9 @@ def guided_registration(request, page_id=0):
     through each category one by one
     '''
 
+    SESSION_KEY = "guided_registration_categories"
+    ASK_FOR_PROFILE = 777  # Magic number. Meh.
+
     next_step = redirect("guided_registration")
 
     sections = []
@@ -71,9 +74,19 @@ def guided_registration(request, page_id=0):
     except ObjectDoesNotExist:
         profile = None
 
-    if not profile:
-        # TODO: if voucherform is invalid, make sure
-        # that profileform does not save
+    # Figure out if we need to show the profile form and the voucher form
+    show_profile_and_voucher = False
+    if SESSION_KEY not in request.session:
+        if not profile:
+            show_profile_and_voucher = True
+    else:
+        if request.session[SESSION_KEY] == ASK_FOR_PROFILE:
+            show_profile_and_voucher = True
+
+    if show_profile_and_voucher:
+        # Keep asking for the profile until everything passes.
+        request.session[SESSION_KEY] = ASK_FOR_PROFILE
+
         voucher_form, voucher_handled = handle_voucher(request, "voucher")
         profile_form, profile_handled = handle_profile(request, "profile")
 
@@ -94,19 +107,23 @@ def guided_registration(request, page_id=0):
     else:
         # We're selling products
 
-        last_category = attendee.highest_complete_category
+        starting = attendee.guided_categories_complete.count() == 0
 
         # Get the next category
         cats = rego.Category.objects
-        cats = cats.filter(id__gt=last_category).order_by("order")
+        if SESSION_KEY in request.session:
+            _cats = request.session[SESSION_KEY]
+            cats = cats.filter(id__in=_cats)
+        else:
+            cats = cats.exclude(
+                id__in=attendee.guided_categories_complete.all(),
+            )
 
-        if cats.count() == 0:
-            # We've filled in every category
-            attendee.completed_registration = True
-            attendee.save()
-            return next_step
+        cats = cats.order_by("order")
+
+        request.session[SESSION_KEY] = []
 
-        if last_category == 0:
+        if starting:
             # Only display the first Category
             title = "Select ticket type"
             current_step = 2
@@ -125,6 +142,12 @@ def guided_registration(request, page_id=0):
             products=all_products,
         ))
 
+        if len(available_products) == 0:
+            # We've filled in every category
+            attendee.completed_registration = True
+            attendee.save()
+            return next_step
+
         for category in cats:
             products = [
                 i for i in available_products
@@ -141,14 +164,17 @@ def guided_registration(request, page_id=0):
                 discounts=discounts,
                 form=products_form,
             )
+
             if products:
-                # This product category does not exist for this user
+                # This product category has items to show.
                 sections.append(section)
+                # Add this to the list of things to show if the form errors.
+                request.session[SESSION_KEY].append(category.id)
 
-            if request.method == "POST" and not products_form.errors:
-                if category.id > attendee.highest_complete_category:
-                    # This is only saved if we pass each form with no errors.
-                    attendee.highest_complete_category = category.id
+                if request.method == "POST" and not products_form.errors:
+                    # This is only saved if we pass each form with no errors,
+                    # and if the form actually has products.
+                    attendee.guided_categories_complete.add(category)
 
     if sections and request.method == "POST":
         for section in sections:
@@ -156,6 +182,8 @@ def guided_registration(request, page_id=0):
                 break
         else:
             attendee.save()
+            if SESSION_KEY in request.session:
+                del request.session[SESSION_KEY]
             # We've successfully processed everything
             return next_step