Steps to reproduce: go into compendium, look for hobgoblin, drag and drop the monster into campaign I looked at the dev console in Chrome and this error is thrown when trying to do it: Compendium item dropped onto canvas! app.js?1522253959:100 <a href="https://app.roll20.net/compendium/dnd5e/Monsters%" rel="nofollow">https://app.roll20.net/compendium/dnd5e/Monsters%</a>... app.js?1522253959:87 Uncaught TypeError: Cannot read property 'indexOf' of undefined at T.s.fullyActivateView (app.js?1522253959:87) at T.s.initialize (app.js?1522253959:87) at T.s.t.View (base.js?1520956594:1) at new T.s (base.js?1520956594:1) at T.s.initialize (app.js?1522253959:87) at T.s.t.Model (base.js?1520956594:1) at new T.s (base.js?1520956594:1) at T.s._prepareModel (base.js?1520956594:1) at T.s.create (base.js?1520956594:1) at T.s.addImage (app.js?1522253959:88)