diff --git a/htdocs/takepos/pay.php b/htdocs/takepos/pay.php
index c0bfc35294a..898b9069ba0 100644
--- a/htdocs/takepos/pay.php
+++ b/htdocs/takepos/pay.php
@@ -41,7 +41,7 @@ $sql="SELECT rowid FROM ".MAIN_DB_PREFIX."facture where facnumber='(PROV-POS-".$
 $resql = $db->query($sql);
 $row = $db->fetch_array ($resql);
 $placeid=$row[0];
-if (! $placeid) $placeid=0; // Developing error message with no lines
+if (! $placeid) $placeid=0; // Invoice not exist
 else{
 	$invoice = new Facture($db);
 	$invoice->fetch($placeid);
@@ -101,15 +101,15 @@ $langs->loadLangs(array("main", "bills", "cashdesk"));
 <button type="button" class="calcbutton" onclick="addreceived(10);">10</button>
 <button type="button" class="calcbutton" onclick="addreceived(20);">20</button>
 <button type="button" class="calcbutton" onclick="addreceived(50);">50</button>
-<button type="button" class="calcbutton2" onclick="Validate('cash');"><?php echo $langs->trans("Cash"); ?></button>
+<button type="button" <?php if ($placeid==0) echo "disabled";?> class="calcbutton2" onclick="Validate('cash');"><?php echo $langs->trans("Cash"); ?></button>
 <button type="button" class="calcbutton" onclick="addreceived(1);">1</button>
 <button type="button" class="calcbutton" onclick="addreceived(2);">2</button>
 <button type="button" class="calcbutton" onclick="addreceived(5);">5</button>
-<button type="button" class="calcbutton2" onclick="Validate('card');"><?php echo $langs->trans("PaymentTypeCB"); ?></button>
+<button type="button" <?php if ($placeid==0) echo "disabled";?> class="calcbutton2" onclick="Validate('card');"><?php echo $langs->trans("PaymentTypeCB"); ?></button>
 <button type="button" class="calcbutton" onclick="addreceived(0.10);">0.10</button>
 <button type="button" class="calcbutton" onclick="addreceived(0.20);">0.20</button>
 <button type="button" class="calcbutton" onclick="addreceived(0.50);">0.50</button>
-<button type="button" class="calcbutton2" onclick="printclick();"><span id="printtext"><?php echo $langs->trans("GoBack"); ?></span></button>
+<button type="button" class="calcbutton2" onclick="parent.$.colorbox.close();"><span id="printtext"><?php echo $langs->trans("GoBack"); ?></span></button>
 <button type="button" class="calcbutton" onclick="addreceived(0.01);">0.01</button>
 <button type="button" class="calcbutton" onclick="addreceived(0.02);">0.02</button>
 <button type="button" class="calcbutton" onclick="addreceived(0.05);">0.05</button>