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fix the null dereference bug reported by coverity scan:
To view the defects in Coverity Scan visit, https://u2389337.ct.sendgrid.net/wf/click?upn=08onrYu34A-2BWcWUl-2F-2BfV0V05UPxvVjWch-2Bd2MGckcRZSbhom32dlDl11LWEm9nX1nbwG-2F526MSwix34kV0EOH7g-2BScYg5Neu8mhD8p0GzKU-3D_EjiwCo132RrzFIz-2FJoE3HNlDqdxVVd-2FAbDB7-2F-2BPiDibeKq-2FZ0zwEtKDTCgNnrTmmQQIyMSmLZSp1NcXNYVJ6Wr-2FdO9p0XeCf9kRUEsIWCXLYhpHJ3nY-2BpGOr4WzKI-2BY8H5YYgxlXfJsYHaUEj-2B2VdUC7fl8zedXRCD171EH8RMvSYozLDHCwaU0hF4CWI0JT1cS0q3K3Z2udDOuRmldmidG0Rfsuujk5ZkLatbRn6-2Fg-3D