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It is only afecting the Dashboard Widget.

I have the same issue but only affecting one of my deployments. As a workaround you can disable the haproxy service temporarily, this will allow you to reload the front dashboard and then you can remove haproxy widget

As a workaround, I change the file like this:

--- /usr/local/www/widgets/widgets/haproxy.widget.php.bak    2023-04-06 18:05:57.343886000 +0200
+++ /usr/local/www/widgets/widgets/haproxy.widget.php    2023-04-06 18:13:45.464869000 +0200
@@ -215,7 +215,7 @@
                         print "<tr><td class=\"listlr\"><div class='text-success'>&nbsp;&nbsp;<i>".$clidata['src']."</i>&nbsp;<a href=\"diag_dns.php?host=".$clidata['srcip']."\" title=\"Reverse Resolve with DNS\">".$log."</a></div></td>";
                         if ($show_clients_traffic == "YES") {
                             $clientstraffic[0] = format_bytes($clidata['session_datareq']);
-                            $clientstraffic[1] = format_bytes($clidata['session_datares']);
+                            $clientstraffic[1] = format_bytes(($clidata['session_datares'] == '<NEVER>') ? 0 : $clidata['session_datares']);
                             print "<td class=\"listlr\" colspan=\"3\"><div class='text-success'>".$clidata['age']." / ".$clientstraffic[0]." / ".$clientstraffic[1]."</div></td></tr>";
                         } else {
                             print "<td class=\"listlr\" colspan=\"3\"><div class='text-success'>".$clidata['age']." / ".$clidata['sessid']."</div></td></tr>";

Sebastian Wagner wrote in #note-7:

As a workaround, I change the file like this:
[...]
I don't know if the default value 0 is correct, but it makes the page working, preventing the constant error messages/mails.

It indeed fixed the issue for me.