Index: class.tslib_fe.php
===================================================================
--- class.tslib_fe.php	(revision 3517)
+++ class.tslib_fe.php	(working copy)
@@ -3735,7 +3735,13 @@
 	 */
 	function prefixLocalAnchorsWithScript()	{
 		$scriptPath = substr(t3lib_div::getIndpEnv('TYPO3_REQUEST_URL'),strlen(t3lib_div::getIndpEnv('TYPO3_SITE_URL')));
-		$this->content = preg_replace('/(<(a|area).*?href=")(#[^"]*")/i','${1}' . htmlspecialchars($scriptPath) . '${3}',$this->content);
+		$original_content = $this->content;
+		$this->content = preg_replace('/(<(a|area).+href=")(#[^"]*")/i','${1}' . htmlspecialchars($scriptPath) . '${3}',$original_content);
+		if(preg_last_error()>0) {
+			//The was an error in call to preg_replace, so keep original content (Behavior prior t PHP 5.2).
+			t3lib_div::sysLog('preg_replace returned error-code: ' . preg_last_error().' in function prefixLocalAnchorsWithScript. Replacement not done!' , 'cms', 4);	
+			$this->content = str_replace(' href="#',' href="'.htmlspecialchars($scriptPath).'#',$original_content);
+		}
 	}
 
 	/**