In the security tab, here is the stack trace:

Mustache_Exception_UnknownVariableException: Unknown variable: previous_successful_login in /usr/share/tuleap/src/vendor/mustache/mustache/src/Mustache/Context.php on line 245
Call Stack
# Time Memory Function Location
1 0.0002 402376 {main}( ) .../index.php:0
2 0.0181 1959816 Tuleap\Request\FrontRouter->route( ) .../index.php:49
3 0.0217 2060248 Tuleap\Request\FrontRouter->routeHandler( ) .../FrontRouter.php:97
4 0.0297 2468192 Tuleap\User\Account\DisplaySecurityController->process( ) .../FrontRouter.php:242
5 0.0719 3262976 MustacheRenderer->renderToPage( ) .../DisplaySecurityController.php:135
6 0.0719 3262976 MustacheRenderer->renderToString( ) .../TemplateRenderer.class.php:65
7 0.0719 3262976 Tuleap\Templating\Mustache\MustacheEngine->render( ) .../MustacheRenderer.class.php:65
8 0.0721 3267024 __Mustache_dc6fb393b60dec77bfc02152a3d2954b->render( ) .../Engine.php:244
9 0.0721 3267520 __Mustache_dc6fb393b60dec77bfc02152a3d2954b->renderInternal( ) .../Template.php:72
10 0.0751 3296584 __Mustache_79d940319c8faf4a94cdfda0d73662af->renderInternal( ) .../__Mustache_dc6fb393b60dec77bfc02152a3d2954b.php:54
11 0.0753 3298408 Mustache_Context->find( ) .../__Mustache_79d940319c8faf4a94cdfda0d73662af.php:70
12 0.0753 3298408 Mustache_Context->findVariableInStack( ) .../Context.php:102