Recently psalm stopped working, throwing

Uncaught Exception: InvalidArgumentException Could not get class storage for spaze\phpstan\rules\disallowed\allowed\allowdirectivesconfig
 Emitted in /.../vendor/vimeo/psalm/src/Psalm/Internal/Provider/ClassLikeStorageProvider.php:45 
.......

(Psalm dev-master@a4de6d9dc092d77871b6097af42498a192362e9a crashed due to an uncaught Throwable)

It is thrown on dozens of different repositories which have typehints or classes that are not present. In example above PHPAT surely has a problem, but it should not kill psalm, especially as psalm configuration has <ignoreFiles><directory name="../vendor"/>.

More so it's thrown on libraries that have optional dependencies, in my case psalm throws the same error on Monolog for the ElasticSearch code (I don't have elastic search as I don't use it, but it's supported by Monolog):

Uncaught Exception: InvalidArgumentException Could not get class storage for elastic\elasticsearch\response\elasticsearch
Emitted in /home/stelshevsky/work/projects/jefe/vendor/vimeo/psalm/src/Psalm/Internal/Provider/ClassLikeStorageProvider.php:45

After requiring different psalm versions (./composer.phar require --dev vimeo/psalm:dev-master#a4de6d9dc092d77871b6097af42498a192362e9a --with-d ependencies), seems this commit causes this:
a4de6d9

Any older version does not have this issue.