Gerhard, have found this error repeating 4 times at that day, so this may be it:
Error: Syntax error, unrecognized expression: #_=_
at Function.t.error (https://pojalabanda.com/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:1:27776)
at t.tokenize (https://pojalabanda.com/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:2:1917)
at t.select (https://pojalabanda.com/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:2:2182)
at Function.t [as find] (https://pojalabanda.com/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:1:17048)
at we.fn.init.find (https://pojalabanda.com/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:2:4467)
at new we.fn.init (https://pojalabanda.com/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:2:4964)
at we (https://pojalabanda.com/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:1:13480)
at https://pojalabanda.com/assets/application-00f63f7f8420595a9520352fbdd7afb384c4d2c2ef0cfc0f465e41ff59223e4f.js:8:5104
at e.invoke (https://pojalabanda.com/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:11624)
at e.flush (https://pojalabanda.com/assets/ember_jquery-cf9339810550f9c92505dfbb37362c58a4a8a83bcee2d99174547b01c06ed7d3.js:9:10577)
BTW, I have noticed many errors reported on logs (was not checking this before regularly) - how should I treat them - as bugs and report them here?