diff --git a/install.php b/install.php
index 51859bf0..79680f8c 100755
--- a/install.php
+++ b/install.php
@@ -84,10 +84,10 @@ $tables = array(
 				  `label` varchar(255) NOT NULL,
 				  `type` enum('service','website') NOT NULL default 'service',
 				  `status` enum('on','off') NOT NULL default 'on',
-				  `error` varchar(255) NOT NULL,
-				   `rtime` FLOAT(9, 7) NOT NULL,
-				  `last_online` datetime NOT NULL,
-				  `last_check` datetime NOT NULL,
+				  `error` varchar(255) NULL,
+				  `rtime` FLOAT(9, 7) NULL,
+				  `last_online` datetime NULL,
+				  `last_check` datetime NULL,
 				  `active` enum('yes','no') NOT NULL default 'yes',
 				  `email` enum('yes','no') NOT NULL default 'yes',
 				  `sms` enum('yes','no') NOT NULL default 'no',