NullPointerException in ProtobufSettingsConfigurable.isModified()

[kshchepanovskyi]

https://sentry.io/ks-projects/protobuf-support/issues/313088285/

NullPointerException: None
    at io.protostuff.jetbrains.plugin.settings.ProtobufSettingsConfigurable.isModified(ProtobufSettingsConfigurable.java:42)
    at com.intellij.openapi.options.ex.ConfigurableWrapper.isModified(ConfigurableWrapper.java:169)
    at com.intellij.openapi.options.newEditor.SettingsEditor.checkModifiedInternal(SettingsEditor.java:385)
    at com.intellij.openapi.options.newEditor.SettingsEditor.checkModifiedForItem(SettingsEditor.java:379)
    at com.intellij.openapi.options.newEditor.SettingsEditor.checkModified(SettingsEditor.java:367)
...
(78 additional frame(s) were not displayed)

null