Unique violation: 7 ERROR: duplicate key value violates unique constraint "users_pkey"

I'm using psql in my Laravel App. I'm trying to create my user, and I keep getting this error

Unique violation: 7 ERROR: duplicate key value violates unique constraint "users_pkey"

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Here what I did

$user = User::where('account_id','=',$id)->first();
$user->email = $account->email_address;
$user->fb_email = '';
$user->tw_email = '';
$user->fb_access_token = '';
$user->fb_profile_id = '';
$user->fb_page_id = '';
$user->fb_username = '';
$user->save();

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Did I do anything that I'm not suppose to?

What I am having right now used to work when I hook my app with MySQL.

Any hints / suggestions will mean a lot to me.

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Screenshot

via Chebli Mohamed