This error arriving due to empty values in registry.

to prevent it, you need to disable ‘compilation’ mode, and if you want to use it, re run it.

php -f shell/compiler.php disable

php -f shell/compiler.php clear

php -f shell/compiler.php compile

This error arriving due to empty values in registry.

to prevent it, you need to disable 'compilation' mode, and if you want to use it, re run it.

php -f shell/compiler.php disable php -f shell/compiler.php clear php -f shell/compiler.php compile