warning: Illegal offset type in taxonomy.module on line 1089 and 1092.

Drupal 4.7.4 upgrade to Drupal 5 RC1

This pops up while adding terms to a new vocab - after upgrade

warning: Illegal offset type in isset or empty in /home/mysite.com/modules/taxonomy/taxonomy.module on line 1088.
warning: Illegal offset type in /home/.needle/jeona/bands.entertainmentavailable.com/modules/taxonomy/taxonomy.module on line 1089.
warning: Illegal offset type in /home/.needle/jeona/bands.entertainmentavailable.com/modules/taxonomy/taxonomy.module on line 1092.

*** turning PathAuto off - resolves issue

thanks