Exception on PyCharm launch

[Former user]

I get an exception with the following stacktrace on launching PyCharm 2018.2.2.

java.lang.Throwable: Error reading/parsing session details file /Users/me/Library/Application Support/PyCharm2018.2/PowerShell/lib/LanguageHost/sessions/PSES-IJ-1534967299157-session.info: java.lang.NullPointerException at com.intellij.openapi.diagnostic.Logger.error(Logger.java:123) at com.intellij.plugin.powershell.lang.lsp.languagehost.EditorServicesLanguageHostStarter.readSessionFile(EditorServicesLanguageHostStarter.kt:244) at com.intellij.plugin.powershell.lang.lsp.languagehost.EditorServicesLanguageHostStarter.startServerSession(EditorServicesLanguageHostStarter.kt:190) at com.intellij.plugin.powershell.lang.lsp.languagehost.EditorServicesLanguageHostStarter.establishConnection(EditorServicesLanguageHostStarter.kt:103) at com.intellij.plugin.powershell.lang.lsp.languagehost.LanguageServerEndpoint.scheduleStart(LanguageServerEndpoint.kt:249) at com.intellij.plugin.powershell.lang.lsp.languagehost.LanguageServerEndpoint.checkStarted(LanguageServerEndpoint.kt:218) at com.intellij.plugin.powershell.lang.lsp.languagehost.LanguageServerEndpoint.connectEditor(LanguageServerEndpoint.kt:113) at com.intellij.plugin.powershell.lang.lsp.LSPInitMain$Companion$editorOpened$1.run(LSPInitMain.kt:89) at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:314) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)