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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [GTK] Plugin process crash in WebKit::NetscapePluginX11::visibilityDidChange"
   href="https://bugs.webkit.org/show_bug.cgi?id=161444">161444</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[GTK] Plugin process crash in WebKit::NetscapePluginX11::visibilityDidChange
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Plug-ins
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>mcatanzaro&#64;igalia.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>bugs-noreply&#64;webkitgtk.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Here's an evince browser plugin crash in WebKit::NetscapePluginX11::visibilityDidChange. After closing an Epiphany tab, WebKit calls gdk_x11_window_get_xid with a NULL GdkWindow:

Thread 1 (Thread 0x7f3255dc6ac0 (LWP 3682)):
#0  0x00007f324b294772 in _gdk_window_has_impl (window=&lt;optimized out&gt;) at gdkwindow.c:626
#1  0x00007f324b294772 in _gdk_window_has_impl (window=window&#64;entry=0x0) at gdkwindow.c:627
#2  0x00007f324b2c798e in gdk_x11_window_get_xid (window=0x0) at gdkwindow-x11.c:5542
#3  0x00007f3253f1343a in WebKit::NetscapePluginX11::visibilityDidChange() (this=0x56156e41ec20) at /usr/src/debug/webkitgtk-2.12.4/Source/WebKit2/WebProcess/Plugins/Netscape/x11/NetscapePluginX11.cpp:267
        windowID = 0
#4  0x00007f3253cad366 in WebKit::PluginControllerProxy::visibilityDidChange(bool) (this=0x56156e42b230, isVisible=&lt;optimized out&gt;) at /usr/src/debug/webkitgtk-2.12.4/Source/WebKit2/PluginProcess/PluginControllerProxy.cpp:437

There's only one report of this ever happening (and it's mine). Full backtrace downstream.</pre>
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