diff --git a/main/inc/lib/database.lib.php b/main/inc/lib/database.lib.php
index 9e2c66e237..2018a3d3a8 100644
--- a/main/inc/lib/database.lib.php
+++ b/main/inc/lib/database.lib.php
@@ -683,6 +683,8 @@ class Database {
         if (strpos($query, 'c_')) {      	
         	//Check if the table contains inner joins 
         	if (
+                    
+                strpos($query, 'allow_public_certificates') === false &&
                 strpos($query, 'DROP TABLE IF EXISTS') === false &&      
                 strpos($query, 'thematic_advance') === false &&  
                 strpos($query, 'thematic_plan') === false &&