$files = array_map( array( $this, 'getLocalPath' ), $files );
// File deps need to be treated separately because they're already prefixed
$files = array_merge( $files, $this->getFileDependencies( $context->getSkin() ) );
+ // Filter out any duplicates from getFileDependencies() and others.
+ // Most commonly introduced by compileLessFile(), which always includes the
+ // entry point Less file we already know about.
+ $files = array_values( array_unique( $files ) );
// If a module is nothing but a list of dependencies, we need to avoid
// giving max() an empty array