hook_block_info() must return an array() - warns "Invalid argument supplied for foreach() in _block_rehash()"

I have the same issue, added details to the block page, hope they release a working patch soon

linkedin_auth, linkedin_profile are the two modules

Yes, hook_block_info() must always return an array.
wrong:

function linkedin_profile_block_info() {
  if (variable_get('linkedin_profile_user_page_enabled', 0) == 3) {
    $blocks['linkedin_profile'] = array(
      'info' => t('LinkedIn Profile'),
      'description' => t('User\'s LinkedIn profile'),
    );
    return $blocks;
  }
}

good:

function linkedin_profile_block_info() {
  $blocks = array();
  if (variable_get('linkedin_profile_user_page_enabled', 0) == 3) {
    $blocks['linkedin_profile'] = array(
      'info' => t('LinkedIn Profile'),
      'description' => t('User\'s LinkedIn profile'),
    );
  }
  return $blocks;
}

Solved my problem when I added it to the profile module.

Hello where do i put the changes?
which folder? which file ?

thanks

One is already fixed in the dev version, patch included for other one

will this be included also. as of march dev version this patch is not

@SocialNicheGuru first thing that has to be done is test this and if it's working mark it as RTBC.

sorry... it works!

changing status according to 9

RTBC indeed. Warning shows on admin/structure/block etc.

See also #1703360: Unnecessary Variable for blocks

Yeah agreed, #1703360: Unnecessary Variable for blocks looks like a better fix than this.

Fixed by #1703360: Unnecessary Variable for blocks