diff --git a/src/bp-core/classes/class-bb-topics-manager.php b/src/bp-core/classes/class-bb-topics-manager.php
index d1f2a7b3db7..cf5be66f16c 100644
--- a/src/bp-core/classes/class-bb-topics-manager.php
+++ b/src/bp-core/classes/class-bb-topics-manager.php
@@ -1726,6 +1726,7 @@ public function bb_migrate_topic_ajax() {
 		$item_type    = isset( $_POST['item_type'] ) ? sanitize_text_field( wp_unslash( $_POST['item_type'] ) ) : '';
 		$new_topic_id = 'migrate' === $migrate_type ? absint( sanitize_text_field( wp_unslash( $_POST['new_topic_id'] ) ) ) : 0;
 
+		$result = array();
 		if ( 'migrate' === $migrate_type && $new_topic_id ) {
 			$result = $this->bb_migrate_topic(
 				array(
diff --git a/src/bp-groups/bp-groups-activity.php b/src/bp-groups/bp-groups-activity.php
index f4ae97d1452..eeeaa7db19d 100644
--- a/src/bp-groups/bp-groups-activity.php
+++ b/src/bp-groups/bp-groups-activity.php
@@ -486,7 +486,7 @@ function groups_record_activity( $args = '' ) {
 				'id'                => $activity->id,
 				'action'            => ! empty( $args['action'] ) ? $args['action'] : $activity->action,
 				'post_title'        => ! empty( $args['post_title'] ) ? $args['post_title'] : $activity->post_title,
-				'title_required'    => ! empty( $args['title_required'] ) ? $args['title_required'] : $activity->title_required,
+				'title_required'    => ! empty( $args['title_required'] ) ? $args['title_required'] : ( $activity->title_required ?? false ),
 				'content'           => ! empty( $args['content'] ) ? $args['content'] : '',
 				'component'         => $activity->component,
 				'type'              => $activity->type,
diff --git a/src/bp-notifications/bp-notifications-functions.php b/src/bp-notifications/bp-notifications-functions.php
index 7602106cf65..9a2e0d03f2d 100644
--- a/src/bp-notifications/bp-notifications-functions.php
+++ b/src/bp-notifications/bp-notifications-functions.php
@@ -1104,7 +1104,7 @@ function bb_notification_avatar() {
 		if ( 'notification' === $object ) {
 			bb_get_default_notification_avatar( 'thumb', $notification );
 			// Get the small icon for the notification which will print beside the avatar.
-			echo wp_kses_post( bb_notification_small_icon( $component_action, true, $notification ) );
+			echo wp_kses_post( bb_notification_small_icon( $component_action, true, $notification ) ?? '' );
 		} else {
 			if ( 'group' === $object ) {
 				$group = new BP_Groups_Group( $item_id );
diff --git a/src/bp-xprofile/classes/class-bp-xprofile-profile-completion-widget.php b/src/bp-xprofile/classes/class-bp-xprofile-profile-completion-widget.php
index 23492cd6429..f7cc87cfdc1 100644
--- a/src/bp-xprofile/classes/class-bp-xprofile-profile-completion-widget.php
+++ b/src/bp-xprofile/classes/class-bp-xprofile-profile-completion-widget.php
@@ -63,6 +63,11 @@ function widget( $args, $instance ) {
 			return;
 		}
 
+		// If no progress data available (e.g. no applicable fields), bail to avoid undefined key warnings.
+		if ( empty( $user_progress ) || ! isset( $user_progress['completion_percentage'] ) ) {
+			return;
+		}
+
 		// Hide the widget if "Hide widget once progress hits 100%" selected and progress is 100%
 		if ( 100 === (int) $user_progress['completion_percentage'] && ! empty( $instance['profile_hide_widget'] ) ) {
 			return;