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    java.lang.NullPointerException
        at org.eclipse.jdt.core.dom.rewrite.ASTRewrite.replace(ASTRewrite.java:438)
        at gr.uom.java.jdeodorant.refactoring.manipulators.ExtractCloneRefactoring.replaceFieldAccessesOfParameterizedFields(ExtractCloneRefactoring.java:3597)
        at gr.uom.java.jdeodorant.refactoring.manipulators.ExtractCloneRefactoring.processASTNodeWithDifferences(ExtractCloneRefactoring.java:3437)
        at gr.uom.java.jdeodorant.refactoring.manipulators.ExtractCloneRefactoring.processCloneStructureNode(ExtractCloneRefactoring.java:2628)
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