Config of project not showing

First time visiting project page, configuration was shown, after updating it, it was not able to unroll it nor change it. Got error:

TypeError: t is null[Ďalšie informácie] scripts.js:10:15817
	Tt</t._getParent http://localhost:4200/scripts.js:10:15817
	a http://localhost:4200/scripts.js:10:12954
	Tt</a._jQueryInterface/< http://localhost:4200/scripts.js:10:16391
	.each http://localhost:4200/scripts.js:2:2571
	w.prototype.each http://localhost:4200/scripts.js:2:1238
	Tt</a._jQueryInterface http://localhost:4200/scripts.js:10:16237
	Bn</< http://localhost:4200/scripts.js:10:16892
	.each http://localhost:4200/scripts.js:2:2571
	w.prototype.each http://localhost:4200/scripts.js:2:1238
	Bn< http://localhost:4200/scripts.js:10:16824
	w.event.dispatch http://localhost:4200/scripts.js:2:41720
	w.event.add/y.handle http://localhost:4200/scripts.js:2:39774
	["./node_modules/zone.js/dist/zone.js"]/</ZoneDelegate.prototype.invokeTask http://localhost:4200/polyfills.js:2743:17
	["./node_modules/zone.js/dist/zone.js"]/</Zone.prototype.runTask http://localhost:4200/polyfills.js:2510:28
	["./node_modules/zone.js/dist/zone.js"]/</ZoneTask.invokeTask http://localhost:4200/polyfills.js:2818:24
	patchEventTarget/invokeTask http://localhost:4200/polyfills.js:3862:9
	patchEventTarget/globalZoneAwareCallback http://localhost:4200/polyfills.js:3888:17

Project info:

ProjectConfig info:

archive_from: 2018-09-12T14:39:00+02:00
submissions_allowed_to: 2018-08-15T14:39:00+02:00
id: 4d8eeb92-ede3-4aa3-b791-683f77858481
updated_at: 2018-08-13T14:39:46.623694+00:00
submission_parameters: {"type":"text"}
test_files_source: git://HW01.repo
submissions_allowed_from: 2018-08-13T14:39:00+02:00
post_submit_script: python for kontr post
project: {'id': '41e427f9-4599-4732-ba38-41dc0230e43e', 'name': 'HW01'}
submissions_cancellation_period: None
pre_submit_script: python for kontr pre
file_whitelist: main.cpp
submission_scheduler_config: python for sub Q
created_at: 2018-08-13T14:39:46.623694+00:00