IPOL template rendering error

Template: result.html

kwargs: {'app': , 'prod': True, 'with_png': False, 'height': 70}

File /srv/ipol/demo/lib/base_app.py, line 226, in tmpl_out
return tmpl.render(**kwargs)

File /usr/local/lib/python2.7/dist-packages/mako/template.py, line 462, in render
return runtime._render(self, self.callable_, args, data)

File /usr/local/lib/python2.7/dist-packages/mako/runtime.py, line 838, in _render
**_kwargs_for_callable(callable_, data))

File /usr/local/lib/python2.7/dist-packages/mako/runtime.py, line 873, in _render_context
_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)

File /usr/local/lib/python2.7/dist-packages/mako/runtime.py, line 899, in _exec_template
callable_(context, *args, **kwargs)

File /srv/ipol/demo/app/g_tv_denoising/template/result.html, line 13, in render_body
%if all(app.cfg['param'][p] != None for p in ['x0', 'y0', 'x', 'y']):

KeyError: 'num_detections'