Getting this error when i'm update product from product grid using update attributes.
Same error had happened to me , it is happening because of execution time out , you can increase it for magento by using
Update attributes also consumes a lot of memory depending on the number of products selected so you may also want to increase memory limit.
So, finally paste following code at the top of
ini_set('memory_limit' , -1); ini_set ( 'max_execution_time', 18000);