--- smart_date_recur.module-	2020-06-11 23:11:17.000000000 +0000
+++ smart_date_recur.module	2020-08-18 22:15:22.852390043 +0000
@@ -235,7 +235,7 @@
   $element['repeat-end'] = [
     '#type' => 'select',
     '#title' => t('Ends'),
-    '#label_attributes' => ['class' => 'pad-left'],
+    '#label_attributes' => ['class' => ['pad-left']],
     '#options' => [
       '' => 'Never',
       'COUNT' => t('After'),
@@ -297,7 +297,7 @@
   $element['repeat-advanced']['interval'] = [
     '#type' => 'number',
     '#title' => t('Every'),
-    '#label_attributes' => ['class' => 'field-interval--label'],
+    '#label_attributes' => ['class' => ['field-interval--label']],
     '#attributes' => ['class' => ['field-interval']],
     '#min' => 1,
     '#step' => 1,
@@ -366,7 +366,7 @@
     '#type' => 'select',
     '#title' => t('Weekday'),
     '#title_display' => t('invisible'),
-    '#label_attributes' => ['class' => 'pad-left'],
+    '#label_attributes' => ['class' => ['pad-left']],
     '#options' => [
       '' => t('- Day (any) -'),
       'SU' => t('Sunday'),