Index: core/units/helpers/category_helper.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- core/units/helpers/category_helper.php	(revision 15775)
+++ core/units/helpers/category_helper.php	(revision )
@@ -150,14 +150,19 @@
 				}
 
 				$base_category = $this->Application->getBaseCategory(); // "Content" category
+
+				if ( isset($items_by_parent[$base_category]) ) {
-				$index_category = $this->findIndexCategoryId($items_by_parent[$base_category]);
+					$index_category = $this->findIndexCategoryId($items_by_parent[$base_category]);
 
-				// rename "Content" into "Home" keeping it's ID
-				$items_by_parent[$parent_mapping[$base_category]][$base_category]['l1_Name'] = $this->Application->Phrase('la_rootcategory_name');
+					// rename "Content" into "Home" keeping it's ID
+					$items_by_parent[$parent_mapping[$base_category]][$base_category]['l1_Name'] = $this->Application->Phrase('la_rootcategory_name');
 
+					if ( $index_category !== false ) {
-				// remove category of "index.tpl" template
-				unset($items_by_parent[$base_category][$index_category]);
-				unset($parent_mapping[$index_category]);
+						// remove category of "index.tpl" template
+						unset($items_by_parent[$base_category][$index_category]);
+						unset($parent_mapping[$index_category]);
+					}
+				}
 			}
 
 			$data = $items_by_parent[$parent_mapping[$parent_category_id]][$parent_category_id];
@@ -350,7 +355,7 @@
 			$templates = $this->Conn->GetCol($sql, 'CategoryId');
 
 			$base_category = $this->Application->getBaseCategory();
-			
+
 			if ( isset($templates[$base_category]) ) {
 				// "Content" category will act as "Home Page"
 				$templates[$base_category] .= '/Index';
\ No newline at end of file