diff --git a/code/SQLite3Connector.php b/code/SQLite3Connector.php
index 95fd340..ab2e8ed 100644
--- a/code/SQLite3Connector.php
+++ b/code/SQLite3Connector.php
@@ -170,7 +170,7 @@ class SQLite3Connector extends DBConnector
 
     public function escapeString($value)
     {
-        return $this->dbConn->escapeString((string)$value);
+        return $this->dbConn->escapeString($value ?? '');
     }
 
     public function selectDatabase($name)