java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.google.javascript.clutz.DeclarationGenerator$TreeWalker.aggregateFieldsFromClass(DeclarationGenerator.java:1633)
at com.google.javascript.clutz.DeclarationGenerator$TreeWalker.getSuperClassFields(DeclarationGenerator.java:1619)
at com.google.javascript.clutz.DeclarationGenerator$TreeWalker.visitObjectType(DeclarationGenerator.java:1565)
at com.google.javascript.clutz.DeclarationGenerator$TreeWalker.visitClassOrInterface(DeclarationGenerator.java:1141)
at com.google.javascript.clutz.DeclarationGenerator$TreeWalker.walk(DeclarationGenerator.java:977)
at com.google.javascript.clutz.DeclarationGenerator$TreeWalker.access$200(DeclarationGenerator.java:914)
at com.google.javascript.clutz.DeclarationGenerator.declareNamespace(DeclarationGenerator.java:602)
at com.google.javascript.clutz.DeclarationGenerator.produceDts(DeclarationGenerator.java:307)
at com.google.javascript.clutz.DeclarationGenerator.generateDeclarations(DeclarationGenerator.java:236)
at com.google.javascript.clutz.DeclarationGenerator.generateDeclarations(DeclarationGenerator.java:217)
at com.google.javascript.clutz.DeclarationGenerator.main(DeclarationGenerator.java:140)

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