Which platform are you playing on? I haven't run into this bug yet but I'll try to find it so I can remove it.
Viewing post in STRIP Battle Action Cards [Demo] comments
The web version has more bugs than the download versions, I haven't gone through and properly debugged the Web version yet. It has to do with the Web version trying to read save data that is not accessible, so it soft-locks. I would suggest trying the download version instead, since a fix to the Web version is very low on my priorities currently 🙏