diff --git a/local-notifications/android/src/main/java/com/capacitorjs/plugins/localnotifications/LocalNotificationManager.java b/local-notifications/android/src/main/java/com/capacitorjs/plugins/localnotifications/LocalNotificationManager.java
index 0b826a546..ba5dde3ae 100644
--- a/local-notifications/android/src/main/java/com/capacitorjs/plugins/localnotifications/LocalNotificationManager.java
+++ b/local-notifications/android/src/main/java/com/capacitorjs/plugins/localnotifications/LocalNotificationManager.java
@@ -332,8 +332,15 @@ private void triggerScheduledNotification(Notification notification, LocalNotifi
         }
         PendingIntent pendingIntent = PendingIntent.getBroadcast(context, request.getId(), notificationIntent, flags);
 
-        // Schedule at specific time (with repeating support)
         Date at = schedule.getAt();
+        String every = schedule.getEvery();
+        DateMatch on = schedule.getOn();
+        if ((at != null ? 0 : 1) + (every != null ? 0 : 1) + (on != null ? 0 : 1) <= 1) {
+            Logger.error(Logger.tags("LN"), "You cannot use multiple scheduler types. Use either 'at', 'every' or 'on' in the schedule object.", null);
+            return;
+        }
+
+        // Schedule at specific time (with repeating support)
         if (at != null) {
             if (at.getTime() < new Date().getTime()) {
                 Logger.error(Logger.tags("LN"), "Scheduled time must be *after* current time", null);
@@ -349,7 +356,6 @@ private void triggerScheduledNotification(Notification notification, LocalNotifi
         }
 
         // Schedule at specific intervals
-        String every = schedule.getEvery();
         if (every != null) {
             Long everyInterval = schedule.getEveryInterval();
             if (everyInterval != null) {
@@ -360,7 +366,6 @@ private void triggerScheduledNotification(Notification notification, LocalNotifi
         }
 
         // Cron like scheduler
-        DateMatch on = schedule.getOn();
         if (on != null) {
             long trigger = on.nextTrigger(new Date());
             notificationIntent.putExtra(TimedNotificationPublisher.CRON_KEY, on.toMatchString());
diff --git a/local-notifications/ios/Sources/LocalNotificationsPlugin/LocalNotificationsPlugin.swift b/local-notifications/ios/Sources/LocalNotificationsPlugin/LocalNotificationsPlugin.swift
index 463be9a12..6ccb0335c 100644
--- a/local-notifications/ios/Sources/LocalNotificationsPlugin/LocalNotificationsPlugin.swift
+++ b/local-notifications/ios/Sources/LocalNotificationsPlugin/LocalNotificationsPlugin.swift
@@ -284,6 +284,11 @@ public class LocalNotificationsPlugin: CAPPlugin, CAPBridgedPlugin {
         let on = schedule["on"] as? JSObject
         let repeats = schedule["repeats"] as? Bool ?? false
 
+        if (at != nil ? 1 : 0) + (on != nil ? 1 : 0) + (every != nil ? 1 : 0) <= 1 {
+            call.reject("You cannot use multiple scheduler types. Use either 'at', 'every' or 'on' in the schedule object.")
+            return nil
+        }
+
         // If there's a specific date for this notificiation
         if let at = at {
             let dateInfo = Calendar.current.dateComponents(in: TimeZone.current, from: at)