bugfix: fix the possible NPE #3597
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wangliang181230
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Ⅰ. Describe what this PR did
根据FindBugs插件提示，找到的可能会导致NPE的BUG。原代码行172行。
Ⅱ. Does this pull request fix one issue?
Ⅲ. Why don't you add test cases (unit test/integration test)?
Ⅳ. Describe how to verify it
Ⅴ. Special notes for reviews