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    Hello,<br>
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    Could you please review the very simple fix:<br>
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          <pre wrap="">Bug: <a class="moz-txt-link-freetext" href="https://bugs.openjdk.java.net/browse/JDK-8175915">https://bugs.openjdk.java.net/browse/JDK-8175915</a>
Webrev: <a class="moz-txt-link-freetext" href="http://cr.openjdk.java.net/~mcherkas/8175915/webrev/">http://cr.openjdk.java.net/~mcherkas/8175915/webrev/</a>

The problem is that for debug message there's no null check, I added this check.

Thanks,
Mikhail. 
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