Lazy experience breaking when I add specific XP to character

First time using an API here - apologies if I should understand this.  I installed Lazy Experience, and it worked great the first time.  Second time, I tried to add XP to specific characters. I could add XP to One character, and it worked.  Adding to more than one character and it breaks, with this message: For reference, the error message generated was:  TypeError: Cannot read property 'characters' of undefined TypeError: Cannot read property 'characters' of undefined at setExperience (apiscript.js:297:53) at handleInput (apiscript.js:149:29) at eval (eval at <anonymous> (/home/node/d20-api-server/api.js:168:1), <anonymous>:65:16) at Object.publish (eval at <anonymous> (/home/node/d20-api-server/api.js:168:1), <anonymous>:70:8) at /home/node/d20-api-server/api.js:1739:12 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) at Zd.Ld.Mb (/home/node/d20-api-server/node_modules/firebase/lib/firebase-node.js:94:425) Thoughts?