State information lost, and no way to restart the request

Suggestions for resolving this problem:

Debug information

SimpleSAML\Error\NoState: NOSTATE

Backtrace:
3 lib/SimpleSAML/Auth/State.php:289 (SimpleSAML\Auth\State::loadState)
2 modules/core/www/loginuserpass.php:22 (require)
1 lib/SimpleSAML/Module.php:266 (SimpleSAML\Module::process)
0 www/module.php:10 (N/A)