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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [GTK] (WebKitWebProcess:26855): GLib-GObject-WARNING **: instance with invalid (NULL) class pointer"
   href="https://bugs.webkit.org/show_bug.cgi?id=167784">167784</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[GTK] (WebKitWebProcess:26855): GLib-GObject-WARNING **: instance with invalid (NULL) class pointer
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </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>WebKit Gtk
          </td>
        </tr>

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

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

        <tr>
          <th>CC</th>
          <td>bugs-noreply&#64;webkitgtk.org
          </td>
        </tr></table>
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        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=300512" name="attach_300512" title="BT from gdb for the WebProcess">attachment 300512</a> <a href="attachment.cgi?id=300512&amp;action=edit" title="BT from gdb for the WebProcess">[details]</a></span>
BT from gdb for the WebProcess

Epiphany 3.22.5 and WebKit 2.15.4.

I'm running Epiphany with the dconf key:

&quot;process-model&quot; = &quot;shared-secondary-process&quot;

And the env variable:

&quot;export G_DEBUG=fatal-warnings&quot;

The compilation was done with CMake args:

'-DENABLE_THREADED_COMPOSITOR=OFF -DPORT=GTK -DCMAKE_BUILD_TYPE=Release -DENABLE_MINIBROWSER=ON -DCMAKE_C_FLAGS_RELEASE=&quot;-O0 -g -DNDEBUG  -DG_DISABLE_CAST_CHECKS&quot; -DCMAKE_CXX_FLAGS_RELEASE=&quot;-O0 -g -DNDEBUG -DG_DISABLE_CAST_CHECKS&quot;'

After visiting several pages, eventually, the WebProcess hits a Warning.

This bug is not reproducible in a predictable way.</pre>
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