diff --git a/addons/web/static/src/views/calendar/calendar_model.js b/addons/web/static/src/views/calendar/calendar_model.js
index 1210d0282bd..443991f4145 100644
--- a/addons/web/static/src/views/calendar/calendar_model.js
+++ b/addons/web/static/src/views/calendar/calendar_model.js
@@ -715,8 +715,9 @@ export class CalendarModel extends Model {
         const colorField = fields[fieldMapping.color];
         const hasFilterColorAttr = !!colorFieldName;
         const sameRelatedModel =
-            colorField.relation === field.relation ||
-            (colorField.related && colorField.related.startsWith(`${fieldName}.`));
+            colorField &&
+            (colorField.relation === field.relation ||
+                (colorField.related && colorField.related.startsWith(`${fieldName}.`)));
         let colorIndex = null;
         if (hasFilterColorAttr || sameRelatedModel) {
             colorIndex = rawFilter.colorIndex;
diff --git a/addons/web/static/tests/views/calendar/calendar_view_tests.js b/addons/web/static/tests/views/calendar/calendar_view_tests.js
index 924a431c64c..6cba24ebad3 100644
--- a/addons/web/static/tests/views/calendar/calendar_view_tests.js
+++ b/addons/web/static/tests/views/calendar/calendar_view_tests.js
@@ -2349,6 +2349,29 @@ QUnit.module("Views", ({ beforeEach }) => {
         );
     });
 
+    QUnit.test(`Colors: dynamic filters without any color attr`, async (assert) => {
+        await makeView({
+            type: "calendar",
+            resModel: "event",
+            serverData,
+            arch: `
+                <calendar date_start="start" date_stop="stop">
+                    <field name="user_id" filters="1" invisible="1"/>
+                </calendar>
+            `,
+        });
+        assert.hasClass(findEvent(target, 1), "o_calendar_color_0");
+        assert.hasClass(findEvent(target, 2), "o_calendar_color_0");
+        assert.hasClass(findEvent(target, 3), "o_calendar_color_0");
+        assert.hasClass(findEvent(target, 4), "o_calendar_color_0");
+        assert.hasClass(findEvent(target, 5), "o_calendar_color_0");
+        assert.containsOnce(target, ".o_calendar_filter[data-name=user_id]");
+        assert.containsNone(
+            findFilterPanelSection(target, "user_id"),
+            "[class*='o_cw_filter_color_']"
+        );
+    });
+
     QUnit.test(`Colors: dynamic filters without color attr (related)`, async (assert) => {
         serverData.models.event.records = [
             {