Thread:Extension talk:LinkedWiki/Unexpected non-MediaWiki exception while saving a page

Hello! I get the follwing exception when I try to save a page to my wiki (MediaWiki 1.17,SMW 1.5.6, LinkedWiki 0.1.0, PHP 5.3.2). My sparql endpoint is local and works fine. Unexpected non-MediaWiki exception encountered, of type "Exception" exception 'Exception' with message '0-- 1--Error unknown. ' in /var/www/vhosts/..../extensions/LinkedWiki/lib/4store/SparqlTools.php:111 Stack trace: But, even though I get this exeption, if I go back to my page, the queries are ok and the expected results are presented. What'swrong? Thank you in advance!
 * 1) 0 /var/www/vhosts/..../extensions/LinkedWiki/class/SMW_LinkedWikiStore.php(113): SparqlTools::insert('_update(Object(SMWSemanticData))
 * 3) 2 /var/www/vhosts/..../extensions/SemanticMediaWiki/includes/SMW_ParseData.php(252): SMW_LinkedWikiStore->updateData(Object(SMWSemanticData))
 * 4) 3 /var/www/vhosts/...../extensions/SemanticMediaWiki/includes/SMW_ParseData.php(406): SMWParseData::storeData(Object(ParserOutput), Object(Title), true)
 * 5) 4 [internal function]: SMWParseData::onLinksUpdateConstructed(Object(LinksUpdate))
 * 6) 5 /var/www/vhosts/..../includes/Hooks.php(158): call_user_func_array(Array, Array)
 * 7) 6 /var/www/vhosts/..../includes/LinksUpdate.php(83): wfRunHooks('LinksUpdateCons...', Array)
 * 8) 7 /var/www/vhosts/..../includes/Article.php(3646): LinksUpdate->__construct(Object(Title), Object(ParserOutput))
 * 9) 8 /var/www/vhosts/..../includes/Article.php(2225): Article->editUpdates('{{#sparql:selec...', '', false, '20110708102128', 14, true)
 * 10) 9 /var/www/vhosts/..../includes/Article.php(1976): Article->doEdit('{{#sparql:selec...', '', 98)
 * 11) 10 /var/www/vhosts/.../includes/EditPage.php(1076): Article->updateArticle('{{#sparql:selec...', , false, false, false, )
 * 12) 11 /var/www/vhosts/.../includes/EditPage.php(2656): EditPage->internalAttemptSave(false, false)
 * 13) 12 /var/www/vhosts/.../includes/EditPage.php(415): EditPage->attemptSave
 * 14) 13 /var/www/vhosts/.../includes/EditPage.php(296): EditPage->edit
 * 15) 14 /var/www/vhosts/.../includes/Wiki.php(522): EditPage->submit
 * 16) 15 /var/www/vhosts/.../includes/Wiki.php(69): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
 * 17) 16 /var/www/vhosts/.../index.php(114): MediaWiki->performRequestForTitle(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
 * 18) 17 {main}