diff --git a/SoObjects/Appointments/SOGoAppointmentFolder.m b/SoObjects/Appointments/SOGoAppointmentFolder.m
index 3d1b61147..5cb6f3281 100644
--- a/SoObjects/Appointments/SOGoAppointmentFolder.m
+++ b/SoObjects/Appointments/SOGoAppointmentFolder.m
@@ -1130,28 +1130,26 @@ firstInstanceCalendarDateRange: (NGCalendarDateRange *) fir
   delta = [masterEndDate timeIntervalSinceDate: [master startDate]];
   recurrenceIdRange = [NGCalendarDateRange calendarDateRangeWithStartDate: recurrenceId
                                                                   endDate: [recurrenceId dateByAddingYears:0 months:0 days:0 hours:0 minutes:0 seconds: delta]];
-  if ([dateRange doesIntersectWithDateRange: recurrenceIdRange])
+  recordIndex = [self _indexOfRecordMatchingDate: recurrenceId inArray: ma];
+  if ([dateRange doesIntersectWithDateRange: recurrenceIdRange] && recordIndex == -1) {
+    [self warnWithFormat:
+                @"missing exception record for recurrence-id %@ (uid %@), ma = %@, dr = %@, rir = %@",
+              recurrenceId, [component uid], ma, dateRange, recurrenceIdRange];
+  }
+  if ([dateRange doesIntersectWithDateRange: recurrenceIdRange] && recordIndex != -1)
     {
       // The recurrence exception intersects with the date range;
       // find the occurence and replace it with the new record
-      recordIndex = [self _indexOfRecordMatchingDate: recurrenceId inArray: ma];
-      if (recordIndex > -1)
-        {
-          if ([dateRange containsDate: [component startDate]] ||
-              (endDate && [dateRange containsDate: endDate]))
-            {
-              // We must pass nil to :container here in order to avoid re-entrancy issues.
-              newRecord = [self _fixupRecord: [component quickRecordFromContent: nil  container: nil  nameInContainer: nil]];
-              [ma replaceObjectAtIndex: recordIndex withObject: newRecord];
-            }
-          else
-            // The range doesn't cover the exception; remove it from the records
-            [ma removeObjectAtIndex: recordIndex];
-        }
-      else
-        [self errorWithFormat:
-                @"missing exception record for recurrence-id %@ (uid %@)",
-              recurrenceId, [component uid]];
+      if ([dateRange containsDate: [component startDate]] ||
+            (endDate && [dateRange containsDate: endDate]))
+          {
+            // We must pass nil to :container here in order to avoid re-entrancy issues.
+            newRecord = [self _fixupRecord: [component quickRecordFromContent: nil  container: nil  nameInContainer: nil]];
+            [ma replaceObjectAtIndex: recordIndex withObject: newRecord];
+          }
+        else
+          // The range doesn't cover the exception; remove it from the records
+          [ma removeObjectAtIndex: recordIndex];
     }
   else
     {