I found if I play a playlist, it will crash the API at its start and when playing a new song. The error message is: TypeError: Cannot set property 'playing' of undefined TypeError: Cannot set property 'playing' of undefined at changeHandler (apiscript.js:5524:38) at eval (eval at <anonymous> (/home/node/d20-api-server/api.js:154:1), <anonymous>:65:16) at Object.publish (eval at <anonymous> (/home/node/d20-api-server/api.js:154:1), <anonymous>:70:8) at TrackedObj.set (/home/node/d20-api-server/api.js:1042:14) at updateLocalCache (/home/node/d20-api-server/api.js:1332:18) at /home/node/d20-api-server/api.js:1544:7 at /home/node/d20-api-server/node_modules/firebase/lib/firebase-node.js:93:560 at hc (/home/node/d20-api-server/node_modules/firebase/lib/firebase-node.js:39:147) at Kd (/home/node/d20-api-server/node_modules/firebase/lib/firebase-node.js:93:546) at Id.Mb (/home/node/d20-api-server/node_modules/firebase/lib/firebase-node.js:93:489) I would then have to restart the API Sandbox. Once I stopped playing any playlists, and play only selected individual songs/sounds, the API would not crash. Any suggestions or does this help track down the issue? Thanks, Andy R Ross