I dont tested long, but i think that unfilled item alias is generated during saving item with diacritic chars. Can you please prove it or disprove it?

I dont have a solutions.

Hi. What do you mean diacritic chars? Can you post an example?

for example i have title: Rozloučení 9. tříd. Special chars are generated into alias too.

Hi. There is an option in component settings if you want to strip any characters that are causing you a problem. K2 strips the most dangerous characters so normally you should not have a problem. Are these characters breaking the links?