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-rw-r--r--modules/block/block.admin.inc2
1 files changed, 2 insertions, 0 deletions
diff --git a/modules/block/block.admin.inc b/modules/block/block.admin.inc
index 80d1321ba..358211f3c 100644
--- a/modules/block/block.admin.inc
+++ b/modules/block/block.admin.inc
@@ -85,6 +85,8 @@ function block_admin_display_form(&$form_state, $blocks, $theme = NULL) {
);
}
}
+ // Do not allow disabling the main system content block.
+ unset($form['system_main']['region']['#options'][BLOCK_REGION_NONE]);
$form['submit'] = array(
'#type' => 'submit',