Error after upgrade to 14.0.0-RC5: Warning: Undefined array key "stg_tabs"

Error After upgrading to 14.0.0-RC5.

I selected my own profile.

Selecting "SPACE" on my Profile's submenu displays the error:

Warning: Undefined array key "stg_tabs" in /public_html/clickandshare.net/modules/base/profile/classes/BxBaseModProfileModule.php on line 2092