diff --git a/Classes/Service/DestinationDataImportService.php b/Classes/Service/DestinationDataImportService.php
index 154c686..6b5b5a2 100644
--- a/Classes/Service/DestinationDataImportService.php
+++ b/Classes/Service/DestinationDataImportService.php
@@ -260,12 +260,11 @@ class DestinationDataImportService
             $this->logger->info('Persist database');
             $this->eventRepository->update($this->tmpCurrentEvent);
             $this->persistenceManager->persistAll();
+            $this->logger->info('Update slugs');
+            $this->slugger->update('tx_events_domain_model_event');
+            $this->slugger->update('tx_events_domain_model_date');
         }
 
-        $this->logger->info('Update slugs');
-        $this->slugger->update('tx_events_domain_model_event');
-        $this->slugger->update('tx_events_domain_model_date');
-
         $this->logger->info('Finished import');
         return 0;
     }
diff --git a/Documentation/Changelog/3.4.0.rst b/Documentation/Changelog/3.4.0.rst
index 7e8e46d..be63657 100644
--- a/Documentation/Changelog/3.4.0.rst
+++ b/Documentation/Changelog/3.4.0.rst
@@ -43,6 +43,13 @@ Fixes
   It didn't check if a file that could be deleted because one event got deleted,
   was still in use by another event.
 
+* Generate slugs after each single event was imported.
+  This should prevent a situation where a large amount of events is imported without
+  having slugs.
+  Routing might break depending on configuration.
+  The time range where this can happen is now reduced as slugs for each event and
+  date is generated right after saving each of them.
+
 Tasks
 -----