Conflict with Markdown plugin

Error

DuplicateComponentKeyRegistrationException: org.intellij.plugins.markdown.settings.MarkdownApplicationSettings

Workaround

Disable the markdown plugin by adding the following line to file disabled_plugins.txt:

org.intellij.plugins.markdown

File location

Windows: $HOME\.IdeaIC2019.1\config\disabled_plugins.txt
Mac: ~/Library/Preferences/.IdeaIC2019.1/disabled_plugins.txt