Using remove_menu_page causes error throughout other admin sections

Thanks for the post – helped me solve that annoying issue as well. Just to clarify for anyone who stumbles onto this post: If you have a function to hide some of the menu items on the left side admin panel, like this:

function mytheme_remove_menu_pages() {
	remove_menu_page('link-manager.php');
	remove_menu_page('edit.php');
	remove_menu_page('upload.php');
	remove_menu_page('edit-comments.php');
}
add_action( 'admin_init', 'mytheme_remove_menu_pages' );

Change the last line to
add_action( 'admin_menu', 'mytheme_remove_menu_pages' );

Thanks for posting this! I thought I was going to have to troubleshoot forever, but I changed my code to the following and it works!

What was Causing the error:
I was changing post status to “draft” via quick edit.

This is the error I had:
Warning: Invalid argument supplied for foreach() in (blah blah) …plugin.php on line 1261

Here is the code I changed like @timfarley posted above:

add_action( 'admin_menu', 'nz_remove_menu_pages' );

function nz_remove_menu_pages() {
  // If the user does not have access to publish posts
  if(!current_user_can('activate_plugins')) {
    // Remove the "Tools" menu
    remove_menu_page('tools.php');
  }
}

First line had previously been:
add_action( ‘admin_init’, ‘nz_remove_menu_pages’ );