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

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java.lang.NullPointerException:
at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:696)
at com.github.javaparser.ast.expr.AssignExpr.accept(AssignExpr.java:87)
at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:1195)
at com.github.javaparser.ast.stmt.ExpressionStmt.accept(ExpressionStmt.java:65)
at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:1170)
at com.github.javaparser.ast.stmt.BlockStmt.accept(BlockStmt.java:68)
at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:1030)
at com.github.javaparser.ast.body.ConstructorDeclaration.accept(ConstructorDeclaration.java:105)
at com.github.javaparser.ast.visitor.DumpVisitor.printMembers(DumpVisitor.java:204)
at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:391)
at com.github.javaparser.ast.body.ClassOrInterfaceDeclaration.accept(ClassOrInterfaceDeclaration.java:97)
at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:297)
at com.github.javaparser.ast.CompilationUnit.accept(CompilationUnit.java:91)
at com.github.javaparser.ast.Node.toString(Node.java:290)

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