<ul>
<li>check dialog_id is not NULL before call delete_presentity_if_dialog_id_exists</li>
</ul>

<p>sometimes after  check_if_dialog(str body, int <em>is_dialog, char *</em>dialog_id) it is possible<br>
is_dialog==1<br>
dialog_id==NULL</p>

<p>#0  __strcmp_sse42 () at ../sysdeps/x86_64/multiarch/strcmp.S:260<br>
<a href="https://github.com/kamailio/kamailio/issues/1" class="issue-link js-issue-link" data-url="https://github.com/kamailio/kamailio/issues/1" data-id="31891578" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#1</a>  0x00007feb2e446603 in delete_presentity_if_dialog_id_exists (presentity=0x7feb545c8ca8, dialog_id=0x0) at presentity.c:419</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/kamailio/kamailio/pull/817'>https://github.com/kamailio/kamailio/pull/817</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>presence: fix crush if dialog id is NULL</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/817/files#diff-0">modules/presence/presentity.c</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/kamailio/kamailio/pull/817.patch'>https://github.com/kamailio/kamailio/pull/817.patch</a></li>
  <li><a href='https://github.com/kamailio/kamailio/pull/817.diff'>https://github.com/kamailio/kamailio/pull/817.diff</a></li>
</ul>

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