diff -ru typo3_src-4.5.6.orig/typo3/sysext/cms/tslib/content/class.tslib_content_user.php typo3_src-4.5.6/typo3/sysext/cms/tslib/content/class.tslib_content_user.php
--- typo3_src-4.5.6.orig/typo3/sysext/cms/tslib/content/class.tslib_content_user.php	2011-10-07 12:47:20.870815537 +0200
+++ typo3_src-4.5.6/typo3/sysext/cms/tslib/content/class.tslib_content_user.php	2011-10-07 12:49:17.273790105 +0200
@@ -47,7 +47,9 @@
 				// Come here only if we are not called from $TSFE->INTincScript_process()!
 			$this->cObj->setUserObjectType(tslib_cObj::OBJECTTYPE_USER);
 		}
-		$this->cObj->includeLibs($conf);
+		if (is_array($conf)) {
+			$this->cObj->includeLibs($conf);
+		}
 		$tempContent = $this->cObj->callUserFunction($conf['userFunc'], $conf, '');
 		if ($this->cObj->doConvertToUserIntObject) {
 			$this->cObj->doConvertToUserIntObject = FALSE;
@@ -66,4 +68,4 @@
 	include_once($GLOBALS['TYPO3_CONF_VARS'][TYPO3_MODE]['XCLASS']['tslib/content/class.tslib_content_user.php']);
 }
 
-?>
\ No newline at end of file
+?>