[svn r11822] Added checks before issuing SQL query

main/install/update-db-scorm-1.6.x-1.8.0.inc.php

@@ -185,12 +185,16 @@ foreach($courses_id_full_table_prefix_list as $course_code => $db)
 		if($old_parent_chap != 0){
 			$new_chap = $lp_chap_items[$old_chap];
 			$new_parent = $lp_chap_items[$old_parent_chap];
+			if(isset($new_chap) && $new_chap != '' 
+				&& isset($new_parent) && $new_parent != '')
+			{
 				$sql_par_chap = "UPDATE $my_new_lp_item " .
 					"SET parent_item_id = $new_parent " .
 					"WHERE id = $new_chap";
 				$res_par_chap = api_sql_query($sql_par_chap,__FILE__,__LINE__);
 			}
 		}
+	}
 	unset($parent_chaps);
 	//Now one loop to set the next_item_id and the previous_item_id
 	foreach($ordered_chaps as $parent_chap){