Failed lookup for key [site_header] when extending admin/change_list.html

i tried to extend change_list.html template from using this two guide https://hakibenita.com/how-to-turn-django-admin-into-a-lightweight-dashboard & https://docs.djangoproject.com/en/dev/ref/contrib/admin/#overriding-vs-replacing-an-admin-template this is my view

@admin.register(summery)
class StaisticsSummery(ModelAdmin):
     change_list_template ="admin/stat_summary_change_list.html"
     def changelist_view(self, request,extra_context=None):
          extra_context = extra_context or {}
          filterUser = request.GET.get("q","")
          filterStart  = request.GET.get("startDate","")
          filterEnd  = request.GET.get("endDate","")
          if filterStart=="":
               filterStart = "1300-01-01"
          if filterEnd=="":
               filterEnd = "1500-12-29"
          result =  list(User.objects.values("username").annotate(
               total_Balance=Sum('statistics__balance',default=0,filter=Q(statistics__created_at__gte=filterStart)|Q(statistics__created_at__lte=filterEnd)),
...)
          ).order_by("username"))
          if(filterUser!="" and filterUser is not None):
               result =result.filter(username=filterUser)
          extra_context["result"]=result
          return  super().changelist_view(request,extra_context)

i request when there was'nt any start and end to querystring everything looks works fine and all result are valid i use the given query in django shell an everything were valid but somehow opt context variable is changing when trying to query with dates via the browser is there any better way to debug this problem related to context object

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