#fixed code
                              public static String removeUnusedImports(
      final String contents, JavadocOnlyImports javadocOnlyImports) {
    CompilationUnit unit = parse(contents);
    if (unit == null) {
      // error handling is done during formatting
      return contents;
    }
    UnusedImportScanner scanner = new UnusedImportScanner();
    unit.accept(scanner);
    return applyReplacements(
        contents,
        buildReplacements(
            contents, unit, scanner.usedNames, scanner.usedInJavadoc, javadocOnlyImports));
  }
#vulnerable code 
                              public static String removeUnusedImports(
      final String contents, JavadocOnlyImports javadocOnlyImports) {
    CompilationUnit unit = parse(contents);
    UnusedImportScanner scanner = new UnusedImportScanner();
    unit.accept(scanner);
    return applyReplacements(
        contents,
        buildReplacements(
            contents, unit, scanner.usedNames, scanner.usedInJavadoc, javadocOnlyImports));
  } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE