Form block - Select input trows error

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Pretty straightforward problem.
The system will trow an error when you forget to fill in a required item while there is a multi select question present in the form.
But only if you have selected one or more options of the multi select input question.

explode() expects parameter 2 to be string, array given


concrete\attributes\select\controller.php on line 559
protected function loadSelectedTagValueFromPost($value)
{
    $em = \Database::get()->getEntityManager();
    $r = $em->getRepository('\Concrete\Core\Entity\Attribute\Value\Value\SelectValueOption');
   $type = $this->attributeKey->getAttributeKeySettings();
   $values = explode(',', $value);
   $response = array();


Status: New

concrete5 Environment Information

# concrete5 Version
Core Version - 8.2.1
Version Installed - 8.2.1
Database Version - 20170802000000

# concrete5 Packages
Kiwi Themes (0.0.1)

# concrete5 Overrides
attributes/date_time/form.php, attributes/date_time

# concrete5 Cache Settings
Block Cache - Off
Overrides Cache - Off
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
Apache/2.4.25 (Win64) PHP/5.6.30

# Server API
apache2handler

# PHP Version
5.6.30

# PHP Extensions
apache2handler, bcmath, calendar, Core, ctype, curl, date, dom, ereg, fileinfo, filter, ftp, gd, gmp, hash, iconv, intl, json, libxml, mbstring, mcrypt, mhash, mysql, mysqli, mysqlnd, odbc, openssl, pcre, PDO, pdo_mysql, PDO_ODBC, pdo_sqlite, Phar, Reflection, session, SimpleXML, soap, SPL, standard, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib

# PHP Settings
max_execution_time - 900
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 900
max_input_vars - 1000
memory_limit - 1024M
post_max_size - 60M
sql.safe_mode - Off
upload_max_filesize - 60M
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
odbc.max_links - Unlimited
odbc.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5

Browser User-Agent String

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36