diff --git a/tbl_addfield.php b/tbl_addfield.php
index 68a0436ce..e3e73fc93 100644
--- a/tbl_addfield.php
+++ b/tbl_addfield.php
@@ -88,7 +88,9 @@ if (isset($_REQUEST['do_save_data'])) {
                 : 'NOT NULL',
             $_REQUEST['field_default_type'][$i], 
             $_REQUEST['field_default_value'][$i],
-            $_REQUEST['field_extra'][$i],
+            isset($_REQUEST['field_extra'][$i])
+                ? $_REQUEST['field_extra'][$i]
+                : false,
             isset($_REQUEST['field_comments'][$i]) 
                 ? $_REQUEST['field_comments'][$i] 
                 : '',
diff --git a/tbl_alter.php b/tbl_alter.php
index 0b5b5baed..e5d78d96b 100644
--- a/tbl_alter.php
+++ b/tbl_alter.php
@@ -60,7 +60,9 @@ if (isset($_REQUEST['do_save_data'])) {
                 : 'NOT NULL',
             $_REQUEST['field_default_type'][$i], 
             $_REQUEST['field_default_value'][$i],
-            $_REQUEST['field_extra'][$i],
+            isset($_REQUEST['field_extra'][$i])
+                ? $_REQUEST['field_extra'][$i]
+                : false,
             isset($_REQUEST['field_comments'][$i]) 
                 ? $_REQUEST['field_comments'][$i] 
                 : '',
diff --git a/tbl_create.php b/tbl_create.php
index b385952e9..a35a1196e 100644
--- a/tbl_create.php
+++ b/tbl_create.php
@@ -120,7 +120,9 @@ if (isset($_REQUEST['do_save_data'])) {
                 : 'NOT NULL',
             $_REQUEST['field_default_type'][$i], 
             $_REQUEST['field_default_value'][$i],
-            $_REQUEST['field_extra'][$i],
+            isset($_REQUEST['field_extra'][$i])
+                ? $_REQUEST['field_extra'][$i]
+                : false,
             isset($_REQUEST['field_comments'][$i]) 
                 ? $_REQUEST['field_comments'][$i] 
                 : '',