Index: typo3/sysext/indexed_search/modfunc1/class.tx_indexedsearch_modfunc1.php
===================================================================
--- typo3/sysext/indexed_search/modfunc1/class.tx_indexedsearch_modfunc1.php	(revision 18587)
+++ typo3/sysext/indexed_search/modfunc1/class.tx_indexedsearch_modfunc1.php	(working copy)
@@ -441,10 +441,13 @@
 
 					// cHash parameters:
 				$arr = unserialize($row['cHashParams']);
-				if (is_array($arr))		{
-					$theCHash = $arr['cHash'];
-					unset($arr['cHash']);
+				if (!is_array($arr)) {
+					$arr = array(
+						'cHash' => $GLOBALS['LANG']->getLL('chash_error')
+					);
 				}
+				$theCHash = $arr['cHash'];
+				unset($arr['cHash']);
 
 				if ($row['item_type'])	{	// pdf...
 					$lines[] = '<td>'.($arr['key'] ? 'Page '.$arr['key'] : '').'&nbsp;</td>';
Index: typo3/sysext/indexed_search/modfunc1/locallang.xml
===================================================================
--- typo3/sysext/indexed_search/modfunc1/locallang.xml	(revision 18587)
+++ typo3/sysext/indexed_search/modfunc1/locallang.xml	(working copy)
@@ -7,6 +7,7 @@
 	<data type="array">
 		<languageKey index="default" type="array">
 			<label index="title">Indexed search</label>
+			<label index="chash_error">Error!</label>
 		</languageKey>
 	</data>
 </T3locallang>
\ No newline at end of file