If you set your wiki to display warnings, visiting a non-existent schema page (on the machine that holds the schemas for event logging) triggers
Warning: Invalid message parameter: a:1:{s:3:"raw";N;} in .../includes/Message.php on line 625
This is coming from the onBeforePageDisplay code in JsonSchemaHooks.php to show the subtitle "Revision nnnn":
$out->addSubtitle( $out->msg( 'eventlogging-revision-id' ) // We use 'rawParams' rather than 'numParams' to make it // easy to copy/paste the value into code. ->rawParams( $out->getRevisionId() )
The Schema page ends up displaying "Revision [INVALID]", which is fine, but the message parsing code is unhappy when the getRevisionId() is NULL (bug?!)
The stack in Message.php is
extractParam() replaceParameters() toString() escaped()
The simplest fix is to cast the revision ID to an integer in JsonSchemaHooks.php line 106:
->rawParams( (integer) $out->getRevisionId() )
which results in displaying "Revision 0" on a new schema page.
Version: unspecified
Severity: minor