That sounds like a frustrating bug, especially when it consistently crashes at the same skill level. It could be a conflict in the skill progression data or a corrupted save file, so reporting it with logs/screenshots might help the devs pinpoint the issue faster. In the meantime, checking performance or compatibility factors with tools like https://bottleneckchecker.org/ may help rule out system-related causes while you wait for a fix.

This looks like a reproducible in-game bug rather than a user error, especially since restarts don’t resolve it. It’s worth checking whether the issue is tied to specific assets or UI elements loading incorrectly at that upgrade stage sometimes even things like icon or texture handling (e.g. skills using transparent PNGs can trigger cra shes. Submitting a detailed bug report with exact steps will likely help the developers fix it faster.