[Plugin: Advanced Custom Fields] acf.data is undefined

I am having the same issue.
It is pretty annoying because the error prevents important jQuery functions of the WordPress backend from loading properly. Under this circumstances ACF is useless.

Any hints or a bug fix is really appreciated.

What works for me is to use an older version (3.1.4) of ACF
That is not really a solution but a work around so that I can use acf for the WP 3.4 based site I am working on.

Same issue, with jquery crashed i can’t use other plugin tools in the page/post editor and also the sub-menus in the left sidebar are disabled.

I’ve tried EVERY versione from 3.2.5 to 3.1.4 (included 3.1.4) but i have the same error

SOLVED: https://www.advancedcustomfields.com/support/discussion/comment/4311#Comment_4311