An unexpected error was returned: 'Unsupported operand types: string * null'

Exception trace:

## /srv/www/u10666/veteran.forum.hu/www/public_html/core/packages/rellectlikessummary/api/likessummary.php(74) Exception Thrown 
#0 /srv/www/u10666/veteran.forum.hu/www/public_html/core/packages/rellectlikessummary/api/likessummary.php(102): Rellectlikessummary_Api_Likessummary->fetchWhoVoted()
#1 phar:///srv/www/u10666/veteran.forum.hu/www/public_html/core/vb/vb.phar/api/wrapper.php(1): Rellectlikessummary_Api_Likessummary->getLikesSummary()
#2 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/api/interface/collapsed.php(105): vB_Api_Wrapper->__call()
#3 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template/runtime.php(1034): Api_Interface_Collapsed->callApi()
#4 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template.php(404) : eval()'d code(31): vB5_Template_Runtime::parseData()
#5 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template.php(404): eval()
#6 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template/cache.php(137): vB5_Template->render()
#7 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template.php(426): vB5_Template_Cache->replacePlaceholders()
#8 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template/cache.php(137): vB5_Template->render()
#9 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template.php(426): vB5_Template_Cache->replacePlaceholders()
#10 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template/cache.php(137): vB5_Template->render()
#11 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template.php(426): vB5_Template_Cache->replacePlaceholders()
#12 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template/cache.php(137): vB5_Template->render()
#13 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template.php(426): vB5_Template_Cache->replacePlaceholders()
#14 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template/cache.php(137): vB5_Template->render()
#15 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template.php(426): vB5_Template_Cache->replacePlaceholders()
#16 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template/cache.php(137): vB5_Template->render()
#17 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template.php(426): vB5_Template_Cache->replacePlaceholders()
#18 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template/cache.php(137): vB5_Template->render()
#19 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/template.php(426): vB5_Template_Cache->replacePlaceholders()
#20 /srv/www/u10666/veteran.forum.hu/www/public_html/includes/vb5/frontend/controller/page.php(277): vB5_Template->render()
#21 /srv/www/u10666/veteran.forum.hu/www/public_html/index.php(65): vB5_Frontend_Controller_Page->index()
#22 {main}