Undefined index: sku in views_handler_filter->accept_exposed_input()

I have no idea what's going on, but my VIEWS module is going hay wire on me today. Does it conflict with other modules?

Notice: Undefined index: sku in views_handler_filter->accept_exposed_input() (line 1273 of .../sites/all/modules/views/handlers/views_handler_filter.inc).

Backtrace:
views_handler_filter->accept_exposed_input(Array) view.inc:1099
view->_build('filter') view.inc:995
view->build() views_plugin_display_page.inc:217
views_plugin_display_page->execute() view.inc:1345
view->execute_display('admin_page', Array) views.module:540
views_page('commerce_products', 'admin_page')
call_user_func_array('views_page', Array) menu.inc:517
menu_execute_active_handler() index.php:21