I ran into this weird bug since last week and curiously only in two of my games. I use the Roll20 5E sheet and the only other script I use is GroupInitiative. I can add XP to the tally and that all works fine. But when i want to payout the script crashes with the following error message: Error: Firebase.update failed: First argument contains NaN in property 'current' Error: Firebase.update failed: First argument contains NaN in property 'current' at Ba (/home/node/d20-api-server/node_modules/firebase/lib/firebase-node.js:9:186) at Ba (/home/node/d20-api-server/node_modules/firebase/lib/firebase-node.js:10:207) at Aa (/home/node/d20-api-server/node_modules/firebase/lib/firebase-node.js:8:462) at Ea (/home/node/d20-api-server/node_modules/firebase/lib/firebase-node.js:10:403) at J.update (/home/node/d20-api-server/node_modules/firebase/lib/firebase-node.js:146:318) at TrackedObj._doSave (/home/node/d20-api-server/api.js:905:27) at Timeout.later [as _onTimeout] (/home/node/d20-api-server/node_modules/underscore/underscore-umd.js:1153:39) at listOnTimeout (internal/timers.js:549:17) at processTimers (internal/timers.js:492:7) There is one more thing that i've noticed in all of my games though. Sometimes EE fails to update the new XP threshold on the characer sheet and then falsly reports that a given character leveled up, even though they did not recieved enough XP to level. Could the cause for this be that some of my players use the charactermancer and some elect not to? I'm not 100% on this, but It could be that one of my players re-used one of their Sheets to make a new character after their previous one died. Maybe that is another cause. Just trying to get as much info across as i can gather.