Thanks Mickaelsy
I change the
INC/common.php on my dokuwiki 2018-04-22b "Greebo" by adding
if($limit == -1) return true; // unlimited
in
function is_mem_available($mem, $bytes = 1048576) {
$limit = trim(ini_get('memory_limit'));
if(empty($limit)) return true; // no limit set!
if($limit == -1) return true; // unlimited
All seems to be ok now: images are loaded now.