IntelliJ IDEA 2018.1 fails to start with optimizer plugin installed

IDEA 2018.1 won’t start up with the optimizer plugin installed:

Internal error. Please report to http://jb.gg/ide/critical-startup-errors

java.lang.IllegalAccessError: tried to access method com.intellij.openapi.vfs.newvfs.persistent.FSRecords.connect()V from class com.zeroturnaround.optimizer.plugin.functions.platform.caches.CacheApi
at com.zeroturnaround.optimizer.plugin.functions.platform.caches.CacheApi.cachesLastCleanedVFS(CacheApi.java:34)
at com.zeroturnaround.optimizer.plugin.functions.platform.caches.CacheApi.cacheLastCleaned(CacheApi.java:17)
at com.zeroturnaround.optimizer.plugin.activities.CleanCacheActivity.doInitialize(CleanCacheActivity.java:22)
at com.zeroturnaround.optimizer.plugin.activities.AbstractActivity.initialize(AbstractActivity.java:29)
at com.zeroturnaround.optimizer.plugin.state.model.ApplicationStateInitializer.initialize(ApplicationStateInitializer.java:20)
at com.zeroturnaround.optimizer.plugin.Bootstrap.initialize(Bootstrap.java:62)
at com.zeroturnaround.optimizer.plugin.Bootstrap.access$000(Bootstrap.java:22)
at com.zeroturnaround.optimizer.plugin.Bootstrap$1.run(Bootstrap.java:37)
at java.lang.Thread.run(Thread.java:745)

Removing ~/.IntelliJIdea2018.1/config/plugins/ft-intellij-optimizer prevents this issue.

It looks like this plugin was abandoned long ago, but I had installed it once and never removed it.