Problem with module MPU6050

Has dump() been tried to look for 'undefined' vars? (e.g. is code module loading)

or try mpu

Another idea to wrap the code snippet in a try/catch code block to see if errors are occurring that are bubbling up and not caught.

Take a peek at the WebIDE console output: (the end of the listing)

WebIDE >> Settings >> Console

It's possible, but a bit unlikely that upgrading to 2v04 might resolve. (not there yet)

Was it noticed that the modules require different operational voltages?

SCL SDA swapped?

Solid grounding between the Espruino device and the module?

Turn off minification. The error on the first screenshot points to prefetchenabled=false in a function signature.
What version of the IDE you have? I thought the latest IDE can minify all of ES6.