Slideshow Generating Page Not Found: Undefined Log Entry

I have noticed a strange entry in the access logs for my site which simply says "Page Not Found Undefined" with a page url of "/undefined". It is generated every time someone visits the homepage at the same time as the log entry for that visit.

After some investigation it appears that this is being generated by a Views Slideshow block on the page which is a rendering an automatically scrolling list of text items (which only appears on that one page). I diagnosed this when I found that the entry in the logs stops appearing if I disable that block. Unfortunately my further investigations have given me no clues as to why this is happening.

Although this bug does not impact upon the average site visitor, it is annoying to have these entries in a log that a client is referring to. Any solutions to this problem or suggestions as to why it is happening would be appreciated. I include below the javascript being generated for the page and a sample of the page source for the block.

Paul

<!--//--><![CDATA[//><!--
jQuery.extend(Drupal.settings, { "basePath": "/", "bibleimgurl": "/sites/all/modules/bible/images/", "datetweaks": { "use_dropdown": false }, "jcarousel": { "ajaxPath": "/jcarousel/ajax/views" }, "lightbox2": { "rtl": 0, "file_path": "/(\\w\\w/)sites/default/files", "default_image": "/sites/all/modules/lightbox2/images/brokenimage.jpg", "border_size": 10, "font_color": "000", "box_color": "fff", "top_position": "", "overlay_opacity": "0.8", "overlay_color": "000", "disable_close_click": 1, "resize_sequence": 0, "resize_speed": 400, "fade_in_speed": 400, "slide_down_speed": 600, "use_alt_layout": 0, "disable_resize": 0, "disable_zoom": 1, "force_show_nav": 0, "show_caption": 1, "loop_items": 0, "node_link_text": "", "node_link_target": 0, "image_count": "", "video_count": "Video !current of !total", "page_count": "Page !current of !total", "lite_press_x_close": "press \x3ca href=\"#\" onclick=\"hideLightbox(); return FALSE;\"\x3e\x3ckbd\x3ex\x3c/kbd\x3e\x3c/a\x3e to close", "download_link_text": "", "enable_login": false, "enable_contact": false, "keys_close": "c x 27", "keys_previous": "p 37", "keys_next": "n 39", "keys_zoom": "z", "keys_play_pause": "32", "display_image_size": "original", "image_node_sizes": "()", "trigger_lightbox_classes": "", "trigger_lightbox_group_classes": "", "trigger_slideshow_classes": "", "trigger_lightframe_classes": "", "trigger_lightframe_group_classes": "", "custom_class_handler": 0, "custom_trigger_classes": "", "disable_for_gallery_lists": true, "disable_for_acidfree_gallery_lists": true, "enable_acidfree_videos": true, "slideshow_interval": 5000, "slideshow_automatic_start": true, "slideshow_automatic_exit": true, "show_play_pause": true, "pause_on_next_click": false, "pause_on_previous_click": true, "loop_slides": false, "iframe_width": 600, "iframe_height": 400, "iframe_border": 1, "enable_video": 0 }, "nice_menus_options": { "delay": 800, "speed": 1 }, "spamspan": { "m": "spamspan", "u": "emuser", "d": "emdom", "h": "h", "t": "t" }, "viewsSlideshowSingleFrame": { "#views_slideshow_singleframe_main_events-block_2": { "num_divs": 6, "id_prefix": "#views_slideshow_singleframe_main_", "div_prefix": "#views_slideshow_singleframe_div_", "vss_id": "events-block_2", "timeout": "6000", "sort": 1, "effect": "scrollVert", "speed": "700", "start_paused": 0, "delay": "0", "fixed_height": "1", "random": "0", "pause": "1", "pause_on_click": "0", "pause_when_hidden": 0, "pause_when_hidden_type": "full", "amount_allowed_visible": "", "remember_slide": 0, "remember_slide_days": "1", "controls": "0", "items_per_slide": "1", "pager": "0", "pager_type": "Thumbnails", "pager_hover": "2", "pager_click_to_page": 0, "image_count": "0", "nowrap": "0", "sync": "1", "advanced": "", "ie": { "cleartype": "true", "cleartypenobg": "false" } } } });
//--><!]]>

<div id="block-views-events-block_2" class="block block-views first last region-odd odd region-count-1 count-3">
  <div class="content">
    <div class="views_view view view-events view-id-events view-display-id-block_2 view-dom-id-4">
      <div class="view-header">
      Forthcoming Events    </div>
      <div class="view-content">
<div id="views_slideshow_singleframe_main_events-block_2" class="views_slideshow_singleframe_main views_slideshow_main"><div id="views_slideshow_singleframe_teaser_section_events-block_2" class="views_slideshow_singleframe_teaser_section"><div class="views_slideshow_singleframe_slide views_slideshow_slide views-row-1 views-row-odd" id="views_slideshow_singleframe_div_events-block_2_0"><div class="views-row views-row-0 views-row-first views-row-odd">
      <div class="event-title">
      <a href="/events/monthly-prayer-group-2011-09-04">Monthly Prayer Group</a>
      </div>
      <div class="event-desc">
      New Prayer Group Starting Up
      </div>
      <div class="event-date">
      <span class="date-display-single">Sunday 4th September 2011 at 11:30</span>
      </div>
      <div class="event-more">
      <a href="/events/monthly-prayer-group-2011-09-04">More information</a>
      </div>
</div>
</div>
<div class="views_slideshow_singleframe_slide views_slideshow_slide views-row-2 views_slideshow_singleframe_hidden views-row-even" id="views_slideshow_singleframe_div_events-block_2_1"><div class="views-row views-row-0 views-row-first views-row-odd">
      <div class="event-title">
      <a href="/events/harvest-barn-dance-2011-10-01">Harvest Barn Dance</a>
      </div>
      <div class="event-desc">
      Live music. Mindset are returning by popular request. Book your tickets now!
      </div>
      <div class="event-date">
      <span class="date-display-single">Saturday 1st October 2011 at 19:00</span>
      </div>
      <div class="event-more">
      <a href="/events/harvest-barn-dance-2011-10-01">More information</a>
      </div>
</div>
</div>
</div>
</div>
    </div>
</div><!-- /.view -->
  </div>
  </div><!-- /.block -->