VirtualFile.refresh() has thrown a Throwable

We found this prefix in 2 webpages.
MapChildren (2)Typical messages (1)TraceDetailed Map
  1. java.lang.Throwable
    1.   at com.intellij.openapi.diagnostic.Logger.error()
    2.   at com.intellij.openapi.diagnostic.FrequentEventDetector.eventHappened()
    3.   at com.intellij.openapi.vfs.newvfs.RefreshQueueImpl.a()
    4.   at com.intellij.openapi.vfs.newvfs.RefreshQueueImpl.execute()
    5.   at com.intellij.openapi.vfs.newvfs.RefreshSessionImpl.launch()
    6.   at com.intellij.openapi.vfs.newvfs.RefreshQueue.refresh()
    7.   at com.intellij.openapi.vfs.newvfs.RefreshQueue.refresh()
    8.   at com.intellij.openapi.vfs.newvfs.NewVirtualFile.refresh()
    9.   at com.intellij.openapi.vfs.VirtualFile.refresh()
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  2. PyCharm sporadically stops accepting keystrokes (may have to do with stacktrace below).

    First:3 years ago
    Last:2 years ago
MessageNumber of crashes
<No message>2
  1. java.lang.Throwable
    1.   at com.intellij.openapi.diagnostic.Logger.error()
    2.   at com.intellij.openapi.diagnostic.FrequentEventDetector.eventHappened()
    3.   at com.intellij.openapi.vfs.newvfs.RefreshQueueImpl.a()
    4.   at com.intellij.openapi.vfs.newvfs.RefreshQueueImpl.execute()
    5.   at com.intellij.openapi.vfs.newvfs.RefreshSessionImpl.launch()
    6.   at com.intellij.openapi.vfs.newvfs.RefreshQueue.refresh()
    7.   at com.intellij.openapi.vfs.newvfs.RefreshQueue.refresh()
    8.   at com.intellij.openapi.vfs.newvfs.NewVirtualFile.refresh()
    9.   at com.intellij.openapi.vfs.VirtualFile.refresh()
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