diff --git a/addons/web/static/src/xml/web_calendar.xml b/addons/web/static/src/xml/web_calendar.xml
index ef2fa72e58d..d3023f6192b 100644
--- a/addons/web/static/src/xml/web_calendar.xml
+++ b/addons/web/static/src/xml/web_calendar.xml
@@ -52,7 +52,7 @@
                             <t t-if="filter.value == 'all'">
                                 <span><i class="fa fa-users fa-fw o_cal_avatar" role="img" aria-label="Avatar" title="Avatar"/></span>
                             </t>
-                            <t t-if="widget.avatar_field &amp;&amp; (filter.value != 'all')">
+                            <t t-if="widget.avatar_field &amp;&amp; (filter.value != 'all') &amp;&amp; (filter.value)">
                                 <img t-attf-src="/web/image/#{widget.avatar_model}/#{filter.value}/#{widget.avatar_field}" class="o_cal_avatar" alt="Avatar"/>
                             </t>
                             <t t-set="color" t-value="widget.getColor(filter.color_index)"/>