diff --git a/beesdoo_shift/README.rst b/beesdoo_shift/README.rst
index f6b85503b..db84096dc 100644
--- a/beesdoo_shift/README.rst
+++ b/beesdoo_shift/README.rst
@@ -47,6 +47,13 @@ Configuration
 Changelog
 =========
 
+12.0.1.1.4 (2022-05-26)
+**Bugfixes**
+
+- When changing a regular worker to an irregular worker via the wizard, no longer
+  give an error when their (former) shift is full. (`#390 <https://github.com/beescoop/obeesdoo/issues/390>`_)
+
+
 12.0.1.1.1 (2022-05-26)
 **Bugfixes**
 
diff --git a/beesdoo_shift/__manifest__.py b/beesdoo_shift/__manifest__.py
index ccae21128..9c9c75167 100644
--- a/beesdoo_shift/__manifest__.py
+++ b/beesdoo_shift/__manifest__.py
@@ -9,7 +9,7 @@
     "author": "Thibault Francois, Elouan Le Bars, Coop IT Easy SCRLfs",
     "website": "https://github.com/beescoop/Obeesdoo",
     "category": "Cooperative management",
-    "version": "12.0.1.1.3",
+    "version": "12.0.1.1.4",
     "depends": ["mail"],
     "data": [
         "data/system_parameter.xml",
diff --git a/beesdoo_shift/readme/HISTORY.rst b/beesdoo_shift/readme/HISTORY.rst
index c93561da4..7d480c953 100644
--- a/beesdoo_shift/readme/HISTORY.rst
+++ b/beesdoo_shift/readme/HISTORY.rst
@@ -1,3 +1,10 @@
+12.0.1.1.4 (2022-05-26)
+**Bugfixes**
+
+- When changing a regular worker to an irregular worker via the wizard, no longer
+  give an error when their (former) shift is full. (`#390 <https://github.com/beescoop/obeesdoo/issues/390>`_)
+
+
 12.0.1.1.1 (2022-05-26)
 **Bugfixes**
 
diff --git a/beesdoo_shift/static/description/index.html b/beesdoo_shift/static/description/index.html
index 1a2bccd2d..effa9dc64 100644
--- a/beesdoo_shift/static/description/index.html
+++ b/beesdoo_shift/static/description/index.html
@@ -372,19 +372,19 @@ <h1 class="title">Beescoop Shift Management</h1>
 <p><strong>Table of contents</strong></p>
 <div class="contents local topic" id="contents">
 <ul class="simple">
-<li><a class="reference internal" href="#configuration" id="id2">Configuration</a></li>
-<li><a class="reference internal" href="#changelog" id="id3">Changelog</a></li>
-<li><a class="reference internal" href="#bug-tracker" id="id4">Bug Tracker</a></li>
-<li><a class="reference internal" href="#credits" id="id5">Credits</a><ul>
-<li><a class="reference internal" href="#authors" id="id6">Authors</a></li>
-<li><a class="reference internal" href="#contributors" id="id7">Contributors</a></li>
-<li><a class="reference internal" href="#maintainers" id="id8">Maintainers</a></li>
+<li><a class="reference internal" href="#configuration" id="id3">Configuration</a></li>
+<li><a class="reference internal" href="#changelog" id="id4">Changelog</a></li>
+<li><a class="reference internal" href="#bug-tracker" id="id5">Bug Tracker</a></li>
+<li><a class="reference internal" href="#credits" id="id6">Credits</a><ul>
+<li><a class="reference internal" href="#authors" id="id7">Authors</a></li>
+<li><a class="reference internal" href="#contributors" id="id8">Contributors</a></li>
+<li><a class="reference internal" href="#maintainers" id="id9">Maintainers</a></li>
 </ul>
 </li>
 </ul>
 </div>
 <div class="section" id="configuration">
-<h1><a class="toc-backref" href="#id2">Configuration</a></h1>
+<h1><a class="toc-backref" href="#id3">Configuration</a></h1>
 <ul class="simple">
 <li>Translate cooperative status selection field, the terms to translate are:<ul>
 <li>shift_status_up_to_date,</li>
@@ -404,7 +404,13 @@ <h1><a class="toc-backref" href="#id2">Configuration</a></h1>
 </ul>
 </div>
 <div class="section" id="changelog">
-<h1><a class="toc-backref" href="#id3">Changelog</a></h1>
+<h1><a class="toc-backref" href="#id4">Changelog</a></h1>
+<p>12.0.1.1.4 (2022-05-26)
+<strong>Bugfixes</strong></p>
+<ul class="simple">
+<li>When changing a regular worker to an irregular worker via the wizard, no longer
+give an error when their (former) shift is full. (<a class="reference external" href="https://github.com/beescoop/obeesdoo/issues/390">#390</a>)</li>
+</ul>
 <p>12.0.1.1.1 (2022-05-26)
 <strong>Bugfixes</strong></p>
 <ul class="simple">
@@ -413,7 +419,7 @@ <h1><a class="toc-backref" href="#id3">Changelog</a></h1>
 </ul>
 </div>
 <div class="section" id="bug-tracker">
-<h1><a class="toc-backref" href="#id4">Bug Tracker</a></h1>
+<h1><a class="toc-backref" href="#id5">Bug Tracker</a></h1>
 <p>Bugs are tracked on <a class="reference external" href="https://github.com/beescoop/obeesdoo/issues">GitHub Issues</a>.
 In case of trouble, please check there if your issue has already been reported.
 If you spotted it first, help us smashing it by providing a detailed and welcomed
@@ -421,9 +427,9 @@ <h1><a class="toc-backref" href="#id4">Bug Tracker</a></h1>
 <p>Do not contact contributors directly about support or help with technical issues.</p>
 </div>
 <div class="section" id="credits">
-<h1><a class="toc-backref" href="#id5">Credits</a></h1>
+<h1><a class="toc-backref" href="#id6">Credits</a></h1>
 <div class="section" id="authors">
-<h2><a class="toc-backref" href="#id6">Authors</a></h2>
+<h2><a class="toc-backref" href="#id7">Authors</a></h2>
 <ul class="simple">
 <li>Thibault Francois</li>
 <li>Elouan Le Bars</li>
@@ -431,14 +437,14 @@ <h2><a class="toc-backref" href="#id6">Authors</a></h2>
 </ul>
 </div>
 <div class="section" id="contributors">
-<h2><a class="toc-backref" href="#id7">Contributors</a></h2>
+<h2><a class="toc-backref" href="#id8">Contributors</a></h2>
 <ul class="simple">
 <li>Beescoop - Cellule IT</li>
 <li>Coop IT Easy SCRLfs</li>
 </ul>
 </div>
 <div class="section" id="maintainers">
-<h2><a class="toc-backref" href="#id8">Maintainers</a></h2>
+<h2><a class="toc-backref" href="#id9">Maintainers</a></h2>
 <p>This module is part of the <a class="reference external" href="https://github.com/beescoop/obeesdoo/tree/12.0/beesdoo_shift">beescoop/obeesdoo</a> project on GitHub.</p>
 <p>You are welcome to contribute.</p>
 </div>
diff --git a/beesdoo_shift/wizard/subscribe.py b/beesdoo_shift/wizard/subscribe.py
index beb708f95..c40d8e3ba 100644
--- a/beesdoo_shift/wizard/subscribe.py
+++ b/beesdoo_shift/wizard/subscribe.py
@@ -138,7 +138,11 @@ def unsubscribe(self):
     @api.multi
     def subscribe(self):
         self = self._check()
-        if self.shift_id and self.shift_id.remaining_worker <= 0:
+        if (
+            self.shift_id
+            and self.working_mode == "regular"
+            and self.shift_id.remaining_worker <= 0
+        ):
             raise UserError(_("There is no remaining spot in this shift"))
 
         # cleanup previous shift template subscriptions