Index: typo3/sysext/install/mod/class.tx_install.php
===================================================================
--- typo3/sysext/install/mod/class.tx_install.php	(revision 8459)
+++ typo3/sysext/install/mod/class.tx_install.php	(working copy)
@@ -8151,7 +8151,7 @@
 				$warningsSubpart = t3lib_parsehtml::substituteSubpart(
 					$warningsSubpart,
 					'###WARNINGITEM###',
-					implode(chr(10), $warningItems)
+					implode(chr(10), $warningItem)
 				);
 			}
 				// Substitute the subpart for warnings