Im getting strangest error in django so far:

'if' statement improperly formatted

Template that raises the error is this:

{% if diff >= 0 %}
<span class="pos">+{{ diff }}
{% else %}
<span class="neg">-{{ diff }}
{% endif %}
</span>
<span>{{ a }}</span>

view that has a and diff in context is this:

def add(request, kaart_id):
    if request.is_ajax() and request.method == 'POST':
    	x = Kaart.objects.get(id=kaart_id)
    	x.pos += 1
    	x.save
    	x = Kaart.objects.get(id=kaart_id)		
    	from django.utils import simplejson
    	diff = x.pos - x.neg
    	a = "(+1)"
    	context = { 'diff':diff, 'a':a }
    	return render_to_response('sum.html', context, context_instance=RequestContext(request))

It does not matter what equation i use in if, >, >=, ==.. they all raise the same error.

and as far as i can tell its all by the book: http://docs.djangoproject.com/en/dev/ref/templates/builtins/#id5

Alan.