You can use the fourth parameter of add_menu_page(), the my_unique_slug, to check if the page exists:
1 2 3 4 5 6 7 8 | if ( empty ( $GLOBALS['admin_page_hooks']['my_unique_slug'] ) ) add_menu_page( 'Page Title', 'Top Menu Title', 'manage_options', 'my_unique_slug', 'my_magic_function' ); |
$GLOBALS['admin_page_hooks'] is the list of registered pages.
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