java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at java.util.HashMap.getEntry(HashMap.java:471)
at java.util.HashMap.containsKey(HashMap.java:453)
at liquibase.changelog.visitor.DBDocVisitor.visit(DBDocVisitor.java:111)
at liquibase.changelog.ChangeLogIterator.run(ChangeLogIterator.java:64)
at liquibase.Liquibase.generateDocumentation(Liquibase.java:827)
at liquibase.integration.commandline.Main.doMigration(Main.java:858)

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