diff --git a/app/src/main/java/eu/faircode/email/CalendarHelper.java b/app/src/main/java/eu/faircode/email/CalendarHelper.java
index 1b3727cd09..b6e983c799 100644
--- a/app/src/main/java/eu/faircode/email/CalendarHelper.java
+++ b/app/src/main/java/eu/faircode/email/CalendarHelper.java
@@ -498,19 +498,25 @@ public class CalendarHelper {
 
     static void delete(Context context, ICalendar icalendar, VEvent event, EntityAccount account, EntityMessage message) {
         String uid = (event.getUid() == null ? null : event.getUid().getValue());
-        if (TextUtils.isEmpty(uid))
+        if (TextUtils.isEmpty(uid)) {
+            EntityLog.log(context, "Delete event without uid");
             return;
+        }
 
         RecurrenceId recurrenceId = event.getProperty(biweekly.property.RecurrenceId.class);
         if (recurrenceId != null) {
             ICalDate start = recurrenceId.getValue();
-            if (!start.hasTime())
+            if (!start.hasTime()) {
+                EntityLog.log(context, "Delete recurring event without start time");
                 return;
+            }
 
             Pair<String, String> selected = getSelectedCalendar(account);
             Long existId = exists(context, selected.first, selected.second, uid);
-            if (existId == null)
+            if (existId == null) {
+                EntityLog.log(context, "Existing recurring event not found uid=" + uid);
                 return;
+            }
 
             ContentValues values = new ContentValues();
             values.put(CalendarContract.Events.ORIGINAL_INSTANCE_TIME, start.getTime());
@@ -527,6 +533,7 @@ public class CalendarHelper {
         }
 
         ContentResolver resolver = context.getContentResolver();
+        boolean found = false;
         try (Cursor cursor = resolver.query(CalendarContract.Events.CONTENT_URI,
                 new String[]{CalendarContract.Events._ID},
                 CalendarContract.Events.UID_2445 + " = ? ",
@@ -540,7 +547,10 @@ public class CalendarHelper {
                 int rows = resolver.delete(deleteUri, null, null);
                 EntityLog.log(context, EntityLog.Type.General, message,
                         "Deleted event id=" + eventId + " uid=" + uid + " rows=" + rows);
+                found = true;
             }
         }
+        if (!found)
+            EntityLog.log(context, "Delete event not found uid=" + uid);
     }
 }