Normally, right clicking with a /Dank/Null while looking at a block causes a single block to be placed. One of my playtesters attempted this and crashed. This created a crash loop that continues until he uninstalled Effortless Building from his client.
Crash log: https://pastebin.com/WCTLkpQ0
I’m using an outdated build of /Dank/Null. The last update has a gamebreaking bug that voids random items from its inventory, making it unusable. Hopefully it’s unrelated.