diff --git a/CHANGES.md b/CHANGES.md
index af4846bdf..1e729770c 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -18,11 +18,12 @@
 - Message deduplication bugfixes and improvements
 - Continuously retry (in 2s intervals) to fetch login credentials (via [credentials_url](https://conversejs.org/docs/html/configuration.html#credentials-url)) in case of failure
 - Replace `moment` with [DayJS](https://github.com/iamkun/dayjs).
-- New config option [auto_focus](https://conversejs.org/docs/html/configuration.html#auto-focus).
-- New config option [enable_smacks](https://conversejs.org/docs/html/configuration.html#enable-smacks).
+- New config option [auto_focus](https://conversejs.org/docs/html/configuration.html#auto-focus)
+- New config option [enable_smacks](https://conversejs.org/docs/html/configuration.html#enable-smacks)
 - New config option [muc_show_join_leave_status](https://conversejs.org/docs/html/configuration.html#muc-show-join-leave-status)
 - New config option [message_limit](https://conversejs.org/docs/html/configuration.html#message-limit)
-- New config option [singleton](https://conversejs.org/docs/html/configuration.html#singleton).
+- New config option [singleton](https://conversejs.org/docs/html/configuration.html#singleton)
+- New config option [muc_mention_autocomplete_min_chars](https://conversejs.org/docs/html/configuration.html#muc-mention-autocomplete-min-chars)
   By setting this option to `false` and `view_mode` to `'embedded'`, it's now possible to
   "embed" the full app and not just a single chat. To embed just a single chat, it's now
   necessary to explicitly set `singleton` to `true`.
@@ -43,6 +44,7 @@
 - #1554: Room auto-configuration broke if the config form contained fields with type `fixed`
 - #1558: `this.get` is not a function error when `forward_messages` is set to `true`.
 - #1572: In `fullscreen` view mode the top is cut off on iOS
+- #1575: MUC invitation autocomplete list doesn't appear
 - #1576: Converse gets stuck with spinner when logging out with `auto_login` set to `true`
 - #1579: Trim spaces at the beginning and end of a JID (when adding contact)
 - #1586: Not possible to kick someone with a space in their nickname
diff --git a/docs/source/configuration.rst b/docs/source/configuration.rst
index 7d3b1422e..5aa30bcf4 100644
--- a/docs/source/configuration.rst
+++ b/docs/source/configuration.rst
@@ -837,6 +837,14 @@ VCard is taken, and if that is not set but `muc_nickname_from_jid`_ is set to
 
 If no nickame value is found, then an error will be raised.
 
+muc_mention_autocomplete_min_chars
+-----------------------------------
+
+* Default:  ``0``
+
+The number of characters that need to be entered before the auto-complete list
+of matching nicknames is shown.
+
 message_archiving
 -----------------
 
diff --git a/src/converse-autocomplete.js b/src/converse-autocomplete.js
index fcb60173b..beff948cb 100644
--- a/src/converse-autocomplete.js
+++ b/src/converse-autocomplete.js
@@ -325,6 +325,7 @@ converse.plugins.add("converse-autocomplete", {
                     ev.keyCode === _converse.keycodes.UP_ARROW ||
                     ev.keyCode === _converse.keycodes.DOWN_ARROW
                 );
+
                 if (!this.auto_evaluate && !this.auto_completing || selecting) {
                     return;
                 }
@@ -335,14 +336,15 @@ converse.plugins.add("converse-autocomplete", {
                 }
 
                 let value = this.match_current_word ? u.getCurrentWord(this.input) : this.input.value;
-
-                let ignore_min_chars = false;
-                if (this.ac_triggers.includes(value[0]) && !this.include_triggers.includes(ev.key)) {
-                    ignore_min_chars = true;
-                    value = value.slice('1');
+                const contains_trigger = this.ac_triggers.includes(value[0]);
+                if (contains_trigger) {
+                    this.auto_completing = true;
+                    if (!this.include_triggers.includes(ev.key)) {
+                        value = value.slice('1');
+                    }
                 }
 
-                if ((value.length >= this.min_chars) || ignore_min_chars) {
+                if ((contains_trigger || value.length) && value.length >= this.min_chars) {
                     this.index = -1;
                     // Populate list with options that match
                     this.ul.innerHTML = "";
@@ -364,7 +366,9 @@ converse.plugins.add("converse-autocomplete", {
                     }
                 } else {
                     this.close({'reason': 'nomatches'});
-                    this.auto_completing = false;
+                    if (!contains_trigger) {
+                        this.auto_completing = false;
+                    }
                 }
             }
         }
diff --git a/src/converse-muc-views.js b/src/converse-muc-views.js
index a70d5cbad..0e2ad1dec 100644
--- a/src/converse-muc-views.js
+++ b/src/converse-muc-views.js
@@ -105,6 +105,7 @@ converse.plugins.add('converse-muc-views', {
             'muc_disable_slash_commands': false,
             'muc_show_join_leave': true,
             'muc_show_join_leave_status': true,
+            'muc_mention_autocomplete_min_chars': 0,
             'roomconfig_whitelist': [],
             'visible_toolbar_buttons': {
                 'toggle_occupants': true
@@ -570,7 +571,7 @@ converse.plugins.add('converse-muc-views', {
                 this.mention_auto_complete = new _converse.AutoComplete(this.el, {
                     'auto_first': true,
                     'auto_evaluate': false,
-                    'min_chars': 1,
+                    'min_chars': _converse.muc_mention_autocomplete_min_chars,
                     'match_current_word': true,
                     'list': () => this.getAutoCompleteList(),
                     'filter': _converse.FILTER_STARTSWITH,
@@ -1859,10 +1860,9 @@ converse.plugins.add('converse-muc-views', {
                     'list': list
                 });
                 this.invite_auto_complete.on('suggestion-box-selectcomplete', ev => this.promptForInvite(ev));
-                this.invite_auto_complete.ul.setAttribute(
-                    'style',
-                    `max-height: calc(${this.el.offsetHeight}px - 80px);`
-                );
+                this.invite_auto_complete.on('suggestion-box-open', ev => {
+                    this.invite_auto_complete.ul.setAttribute('style', `max-height: calc(${this.el.offsetHeight}px - 80px);`);
+                });
             }
         });
 
diff --git a/src/headless/converse-chatboxes.js b/src/headless/converse-chatboxes.js
index 16a93f94e..d626e3a35 100644
--- a/src/headless/converse-chatboxes.js
+++ b/src/headless/converse-chatboxes.js
@@ -984,7 +984,7 @@ converse.plugins.add('converse-chatboxes', {
             },
 
             onChatBoxesFetched (collection) {
-                /* Show chat boxes upon receiving them from sessionStorage */
+                /* Show chat boxes upon receiving them from storage */
                 collection.filter(c => !c.isValid()).forEach(c => c.destroy());
                 collection.forEach(c => c.maybeShow());
                 /**
diff --git a/src/headless/converse-muc.js b/src/headless/converse-muc.js
index 30042ac54..008619e21 100644
--- a/src/headless/converse-muc.js
+++ b/src/headless/converse-muc.js
@@ -2000,7 +2000,7 @@ converse.plugins.add('converse-muc', {
                  *     JIDs of the chatroom(s) to create
                  * @param {object} [attrs] attrs The room attributes
                  */
-                'create' (jids, attrs) {
+                create (jids, attrs) {
                     if (_.isString(attrs)) {
                         attrs = {'nick': attrs};
                     } else if (_.isUndefined(attrs)) {