Notice: Undefined property: stdClass::$print_display in print_node_update()

Notice: Undefined property: stdClass::$print_display in print_node_update() (line 492 of /home/kiv/cbsee_trunk/sites/all/modules/print/print.module).
Notice: Undefined property: stdClass::$print_display_comment in print_node_update() (line 493 of /home/kiv/cbsee_trunk/sites/all/modules/print/print.module).
Notice: Undefined property: stdClass::$print_display_urllist in print_node_update() (line 494 of /home/kiv/cbsee_trunk/sites/all/modules/print/print.module).
Notice: Undefined property: stdClass::$print_mail_display in print_mail_node_update() (line 251 of /home/kiv/cbsee_trunk/sites/all/modules/print/print_mail/print_mail.module).
Notice: Undefined property: stdClass::$print_mail_display_comment in print_mail_node_update() (line 252 of /home/kiv/cbsee_trunk/sites/all/modules/print/print_mail/print_mail.module).
Notice: Undefined property: stdClass::$print_mail_display_urllist in print_mail_node_update() (line 253 of /home/kiv/cbsee_trunk/sites/all/modules/print/print_mail/print_mail.module).
Notice: Undefined property: stdClass::$print_pdf_display in print_pdf_node_update() (line 366 of /home/kiv/cbsee_trunk/sites/all/modules/print/print_pdf/print_pdf.module).
Notice: Undefined property: stdClass::$print_pdf_display_comment in print_pdf_node_update() (line 367 of /home/kiv/cbsee_trunk/sites/all/modules/print/print_pdf/print_pdf.module).
Notice: Undefined property: stdClass::$print_pdf_display_urllist in print_pdf_node_update() (line 368 of /home/kiv/cbsee_trunk/sites/all/modules/print/print_pdf/print_pdf.module).

Please, change compires like
if ($node->print_display === NULL)
to
if (!isset($node->print_display))

It will not cause Notice if object doesn't have properties.

- if ($node->print_display === NULL) $node->print_display = variable_get('print_display_' . $node->type, PRINT_TYPE_SHOW_LINK_DEFAULT);
+ if (!isset($node->print_display)) $node->print_display = variable_get('print_display_' . $node->type, PRINT_TYPE_SHOW_LINK_DEFAULT);