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      <base href="https://bugs.webkit.org/" />
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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 - Assertion failure in NetscapePlugin::registerRedirect"
   href="https://bugs.webkit.org/show_bug.cgi?id=152595">152595</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Assertion failure in NetscapePlugin::registerRedirect
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>WebKit Local 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>Plug-ins
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>cory.kim&#64;navercorp.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>When loading <a href="http://www.ft.com">http://www.ft.com</a>, 

void NetscapePlugin::registerRedirect(NetscapePluginStream* stream, const URL&amp; requestURL, int redirectResponseStatus, void* notificationData)
{
#if ENABLE(NETWORK_PROCESS)
    // NPP_URLRedirectNotify may synchronously request this stream back out, so set it first
    m_redirects.set(notificationData, std::make_pair(stream, requestURL.string()));

At this time, notificationData is always nullptr.

Below code throws KeyTraits::emptyValue 

    void HashTable&lt;Key, Value, Extractor, HashFunctions, Traits, KeyTraits&gt;::checkKey(const T&amp; key)
    {
        if (!HashFunctions::safeToCompareToEmptyOrDeleted)
            return;
        ASSERT(!HashTranslator::equal(KeyTraits::emptyValue(), key));</pre>
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