Undefined index error in pages with php block

[vences]

I'm using drupal 7, with CiviCRM 4.4.6. I have a PHP block in my drupal header block.

Undefined index error as below appears in every page which PHP block appears.

Notice: Undefined index: CiviCRM in eval() (line 7 of /home/mydomain/www/civicrm/modules/php/php.module(80) : eval()'d code).

When I remove the PHP block, this error disappears.

Is there any method I can configure it so that I can display PHP block without CiviCRM error?

[Hershel]

Your term "PHP Block" would infer that it's a block with custom PHP code. You would need to debug that code and fix it, that's all.