WordPress: Notice: Trying to get property of non-object

I updated a Contact-Form-7 plugin on my WordPress site, and now am getting this error:

Notice: Undefined index: contact-form-7 in /home/kilowa5/public_html/wp-includes/class.wp-scripts.php on line 250

Notice: Trying to get property of non-object in /home/kilowa5/public_html/wp-includes/class.wp-scripts.php on line 250

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Here are lines 241-258 of the class.wp-scripts.php file:

}

/**
 * @param string $handle    Name of the item. Should be unique.
 * @param bool   $recursion Internal flag that calling function was called recursively.
 * @param mixed  $group     Group level.
 * @return bool Not already in the group or a lower group
 */
public function set_group( $handle, $recursion, $group = false ) {
    if ( $this->registered[$handle]->args === 1 )
        $grp = 1;
    else
        $grp = (int) $this->get_data( $handle, 'group' );

    if ( false !== $group && $grp > $group )
        $grp = $group;

    return parent::set_group( $handle, $recursion, $grp );

Line 250 is if ( $this->registered[$handle]->args === 1 )

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