Warning: Invalid argument supplied for foreach() in SqlWalker.php line 899

Hallo, i get the error
Warning: Invalid argument supplied for foreach() in /var/www/phverbose/vendor/doctrine/Doctrine/ORM/Query/SqlWalker.php line 899

Here is the line
foreach ($assoc['relationToTargetKeyColumns'] as $relationColumn => $targetColumn) {

Here are the relations and the query
http://pastie.org/4352511
http://pastie.org/4352498

Here is the dump of $assoc before warning

array(16) {
["fieldName"]=>
string(5) "sites"
["joinTable"]=>
array(0) {
}
["targetEntity"]=>
string(13) "Entities\Site"
["mappedBy"]=>
string(6) "emails"
["inversedBy"]=>
NULL
["cascade"]=>
array(1)

["orphanRemoval"]=>
bool(false)
["fetch"]=>
int(2)
["type"]=>
int(8)
["isOwningSide"]=>
bool(false)
["sourceEntity"]=>
string(14) "Entities\Email"
["isCascadeRemove"]=>
bool(false)
["isCascadePersist"]=>
bool(true)
["isCascadeRefresh"]=>
bool(false)
["isCascadeMerge"]=>
bool(false)
["isCascadeDetach"]=>
bool(false)
}