entity.js:221 Uncaught TypeError: Cannot read property 'stringify' of undefined
at entity.js:221
at Array.forEach (<anonymous>)
at _multi (entity.js:220)
at stringifyComponentValue (entity.js:212)
at entity.js:195
at Array.forEach (<anonymous>)
at optimizeComponents (entity.js:182)
at prepareForSerialization (entity.js:167)
at prepareForSerialization (entity.js:164)
at prepareForSerialization (entity.js:164)
/cc @delapuente