$wiki = isset($this->mParams['wiki']) ? $this->mParams['wiki'] : false;
$lb =& $this->getLoadBalancer( $cluster );
- if ( !in_array( "DB://" . $cluster, $wgDefaultExternalStore ) ) {
+ if ( !in_array( "DB://" . $cluster, (array)$wgDefaultExternalStore ) ) {
wfDebug( "read only external store" );
$lb->allowLagged(true);
} else {