[FIX] pos: the widget.pos.cashier is not always defined

addons/point_of_sale/static/src/xml/pos.xml

@@ -631,7 +631,7 @@
             <br />
             <t t-esc="widget.pos.company.name"/><br />
             Phone: <t t-esc="widget.pos.company.phone || ''"/><br />
-            User: <t t-esc="widget.pos.cashier.name"/><br />
+            User: <t t-esc="widget.pos.cashier ? widget.pos.cashier.name : widget.pos.user.name"/><br />
             Shop: <t t-esc="widget.pos.shop.name"/><br />
             <br />
             <t t-if="widget.pos.config.receipt_header">