diff --git a/protected/humhub/docs/CHANGELOG_DEV.md b/protected/humhub/docs/CHANGELOG_DEV.md
index 102d65c1c0..04425fdd4c 100644
--- a/protected/humhub/docs/CHANGELOG_DEV.md
+++ b/protected/humhub/docs/CHANGELOG_DEV.md
@@ -13,6 +13,7 @@ HumHub Change Log (DEVELOP)
 - Enh: **Theme:** use of colored required input field asterisk
 - Fix #3784: `ActiveQueryContent::readable()` not working for global content
 - Chng: Removed italic text from summary mail of comment and content activities for better readability
+- Fix #3805: Cannot select more than one activity in E-Mail Summaries settings
 
 
 1.4.0-beta.2
diff --git a/protected/humhub/modules/activity/views/mailSummaryForm.php b/protected/humhub/modules/activity/views/mailSummaryForm.php
index 9df9903832..48c397420f 100644
--- a/protected/humhub/modules/activity/views/mailSummaryForm.php
+++ b/protected/humhub/modules/activity/views/mailSummaryForm.php
@@ -14,19 +14,20 @@ use yii\bootstrap\ActiveForm;
 use humhub\modules\space\widgets\SpacePickerField;
 ?>
 
-<?php $form = ActiveForm::begin(); ?>
-<?= $form->field($model, 'interval')->dropDownList($model->getIntervals()); ?>
-<?= $form->field($model, 'limitSpacesMode')->radioList($model->getLimitSpaceModes()); ?>
-<?= $form->field($model, 'limitSpaces')->widget(SpacePickerField::class, [])->label(false); ?>
-<?= $form->field($model, 'activities')->checkboxList($model->getActivitiesArray(), [
-	'labelOptions' => [
-		'encode' => false
-	], 'encode' => true]); ?>
+<?php $form = ActiveForm::begin(['enableClientValidation' => false]); ?>
 
-<br>
-<?= Html::saveButton(); ?>
-<?php if ($model->userSettingsLoaded): ?>
-    <?= Html::a(Yii::t('NotificationModule.base', 'Reset to defaults'), ['reset'], ['class' => 'btn btn-default pull-right', 'data-ui-loader' => '', 'data-method' => 'POST']); ?>
-<?php endif; ?>
+    <?= $form->field($model, 'interval')->dropDownList($model->getIntervals()); ?>
+    <?= $form->field($model, 'limitSpacesMode')->radioList($model->getLimitSpaceModes()); ?>
+    <?= $form->field($model, 'limitSpaces')->widget(SpacePickerField::class, [])->label(false); ?>
+    <?= $form->field($model, 'activities')->checkboxList($model->getActivitiesArray(), [
+        'labelOptions' => [
+            'encode' => false
+        ], 'encode' => true]); ?>
 
-<?php ActiveForm::end(); ?>
\ No newline at end of file
+    <br>
+    <?= Html::saveButton(); ?>
+    <?php if ($model->userSettingsLoaded): ?>
+        <?= Html::a(Yii::t('NotificationModule.base', 'Reset to defaults'), ['reset'], ['class' => 'btn btn-default pull-right', 'data-ui-loader' => '', 'data-method' => 'POST']); ?>
+    <?php endif; ?>
+
+<?php ActiveForm::end(); ?>
diff --git a/protected/humhub/modules/activity/views/user/defaults.php b/protected/humhub/modules/activity/views/user/defaults.php
index 528af3b637..a77ee3c867 100644
--- a/protected/humhub/modules/activity/views/user/defaults.php
+++ b/protected/humhub/modules/activity/views/user/defaults.php
@@ -6,8 +6,11 @@
  * @license https://www.humhub.com/licences
  */
 
-/* @var $model \humhub\modules\notification\models\forms\NotificationSettings */
-?>
+use humhub\modules\activity\models\MailSummaryForm;
+
+/* @var $model MailSummaryForm */
+
+ ?>
 
 <div class="panel-heading">
     <?= Yii::t('ActivityModule.base', '<strong>E-Mail</strong> Summaries'); ?>
@@ -17,7 +20,7 @@
         <?= Yii::t('ActivityModule.base', 'E-Mail summaries are sent to inform you about recent activities in the network.'); ?><br />
         <?= Yii::t('ActivityModule.base', 'On this page you can configure the contents and the interval of these e-mail updates.'); ?><br />
     </div>
-    
+
     <?= $this->render('@activity/views/mailSummaryForm', ['model' => $model]); ?>
 </div>