diff --git a/htdocs/core/db/mysqli.class.php b/htdocs/core/db/mysqli.class.php
index 593a9454b6f..a392e374d0b 100644
--- a/htdocs/core/db/mysqli.class.php
+++ b/htdocs/core/db/mysqli.class.php
@@ -757,6 +757,9 @@ class DoliDBMysqli extends DoliDB
 		// phpcs:enable
 		// FIXME: $fulltext_keys parameter is unused
 
+		$pk = '';
+		$sqluq = $sqlk = array();
+
 		// cles recherchees dans le tableau des descriptions (fields) : type,value,attribute,null,default,extra
 		// ex. : $fields['rowid'] = array('type'=>'int','value'=>'11','null'=>'not null','extra'=> 'auto_increment');
 		$sql = "CREATE TABLE ".$table."(";