It was something about "text", can't remember the full message. But when this happened, I had to restart the game. But, I tried it now and it went okay. I can't tell how it got fixed. All I can say is that it got fixed after visiting the Milk Farm with Cassie. (I was playing Android version btw).
It seems that this bug was something rare, but it's fine now. Well, while we're at it, do you know how many interactions are there to fulfill "Hang out with Cassie and Alissa" quest? I reached a certain moment with Alissa becoming an actual pet, but the quest is still up and I don't know what else I can do.