ize_hex_color() when possible.
 *
 * Saving hex colors without a hash puts the burden of adding the hash on the
 * UI, which makes it difficult to use or upgrade to other color types such as
 * rgba, hsl, rgb, and HTML color names.
 *
 * Returns either '', a 3 or 6 digit hex color (without a #), or null.
 *
 * @since 3.4.0
 *
 * @param string $color The color value to sanitize. Can be with or without a #.
 * @return string|null The sanitized hex color without the hash prefix,
 *                     empty string if input is empty, or null if invalid.
 */
function sanitize_hex_color_no_hash( $color ) {
	$color = ltrim( $color, '#' );

	if ( '' === $color ) {
		return '';
	}

	return sanitize_hex_color( '#' . $color ) ? $color : null;
}

/**
 * Ensures that any hex color is properly hashed.
 * Otherwise, returns value untouched.
 *
 * This method should only be necessary if using sanitize_hex_color_no_hash().
 *
 * @since 3.4.0
 *
 * @param string $color The color value to add the hash prefix to. Can be with or without a #.
 * @return string The color with the hash prefix if it's a valid hex color,
 *                otherwise the original value.
 */
function maybe_hash_hex_color( $color ) {
	$unhashed = sanitize_hex_color_no_hash( $color );
	if ( $unhashed ) {
		return '#' . $unhashed;
	}

	return $color;
}
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function esc_sql() in /home/he2a35ddd308f/public_html/wp-includes/option.php:627
Stack trace:
#0 /home/he2a35ddd308f/public_html/wp-includes/functions.php(1794): wp_load_alloptions()
#1 /home/he2a35ddd308f/public_html/wp-includes/load.php(943): is_blog_installed()
#2 /home/he2a35ddd308f/public_html/wp-settings.php(180): wp_not_installed()
#3 /home/he2a35ddd308f/public_html/wp-config.php(75): require_once('/home/he2a35ddd...')
#4 /home/he2a35ddd308f/public_html/wp-load.php(50): require_once('/home/he2a35ddd...')
#5 /home/he2a35ddd308f/public_html/wp-blog-header.php(13): require_once('/home/he2a35ddd...')
#6 /home/he2a35ddd308f/public_html/index.php(17): require('/home/he2a35ddd...')
#7 {main}
  thrown in <b>/home/he2a35ddd308f/public_html/wp-includes/option.php</b> on line <b>627</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function esc_sql() in /home/he2a35ddd308f/public_html/wp-includes/option.php:627
Stack trace:
#0 /home/he2a35ddd308f/public_html/wp-includes/option.php(164): wp_load_alloptions()
#1 /home/he2a35ddd308f/public_html/wp-includes/l10n.php(63): get_option('WPLANG')
#2 /home/he2a35ddd308f/public_html/wp-includes/l10n.php(166): get_locale()
#3 /home/he2a35ddd308f/public_html/wp-includes/l10n.php(954): determine_locale()
#4 /home/he2a35ddd308f/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#5 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#6 {main}
  thrown in <b>/home/he2a35ddd308f/public_html/wp-includes/option.php</b> on line <b>627</b><br />