Bugfix. Stanza passed in as 2nd parameter

dist/converse.js

@@ -74563,7 +74563,7 @@ var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_
 
       });
 
-      _converse.onMAMError = function (iq) {
+      _converse.onMAMError = function (model, iq) {
         if (iq.querySelectorAll('feature-not-implemented').length) {
           _converse.log("Message Archive Management (XEP-0313) not supported by this server", Strophe.LogLevel.WARN);
         } else {

src/converse-mam.js

@@ -320,7 +320,7 @@
                 message_archiving_timeout: 8000, // Time (in milliseconds) to wait before aborting MAM request
             });
 
-            _converse.onMAMError = function (iq) {
+            _converse.onMAMError = function (model, iq) {
                 if (iq.querySelectorAll('feature-not-implemented').length) {
                     _converse.log(
                         "Message Archive Management (XEP-0313) not supported by this server",