Warning apache in geodirectory_hooks_actions.php

Good afternoon. We are experiencing an error in the apache server. The error/warning is this

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AH01071: Got error ‘PHP message: PHP Warning: json_encode(): Invalid UTF-8 sequence in argument in /var/www/vhosts/creaciondempresas.es/httpdocs/wp-content/plugins/geodirectory/geodirectory_hooks_actions.php on line 1332\nPHP message: PHP Warning: json_encode(): Invalid UTF-8 sequence in argument in /var/www/vhosts/creaciondempresas.es/httpdocs/wp-content/plugins/geodirectory/geodirectory_hooks_actions.php on line 1332
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The same message is repeated several more times and it is reproduce again in each load that have geodirectory elements (widgets)

The 1332 line is this I mark in bold
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/**
* Filters the translated JS strings from function geodir_localize_all_js_msg().
*
* With this filter you can add, remove or change translated JS strings.
* You should add your own translations to this if you are building an addon rather than adding another script block.
*
* @since 1.0.0
*/
$arr_alert_msg = apply_filters(‘geodir_all_js_msg’, $arr_alert_msg);

foreach ($arr_alert_msg as $key => $value) {
if (!is_scalar($value))
continue;
$arr_alert_msg[$key] = html_entity_decode((string)$value, ENT_QUOTES, ‘UTF-8’);
}

$script = “var geodir_all_js_msg = ” . json_encode($arr_alert_msg) . ‘;’;
echo ‘<script>’;
echo $script;
echo ‘</script>’;
}

add_action(‘admin_bar_menu’, ‘geodir_admin_bar_site_menu’, 31);

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Do you know what can be the problem and how to fix it?
Is it posible that this error/warning get the entire web down?

Thanks in advance