diff --git a/mara_pipelines/logging/run_log.py b/mara_pipelines/logging/run_log.py
index d40efd5..9c85c47 100644
--- a/mara_pipelines/logging/run_log.py
+++ b/mara_pipelines/logging/run_log.py
@@ -166,6 +166,8 @@ def handle_event(self, event: events.Event):
                 # will come in 1 sec (default, if not changed...)
                 print(f'Ignored problem on inserting system statistic events into the table: {e!r}', flush=True)
         elif isinstance(event, pipeline_events.NodeFinished):
+            key = tuple(event.node_path)
+
             with mara_db.postgresql.postgres_cursor_context('mara') as cursor:  # type: psycopg2.extensions.cursor
                 cursor.execute(f'''
 UPDATE data_integration_node_run
@@ -179,7 +181,9 @@ def handle_event(self, event: events.Event):
 VALUES ''' + ','.join([cursor.mogrify('(%s,%s,%s,%s,%s)', (node_run_id, output_event.timestamp, output_event.message,
                                                            output_event.format, output_event.is_error))
                       .decode('utf-8')
-                       for output_event in self.node_output.get(tuple(event.node_path))]))
+                       for output_event in self.node_output.get(key)]))
+
+            del self.node_output[key]
 
         elif isinstance(event, pipeline_events.RunFinished):
             with mara_db.postgresql.postgres_cursor_context('mara') as cursor:  # type: psycopg2.extensions.cursor
@@ -206,3 +210,5 @@ def handle_event(self, event: events.Event):
                 cursor.execute(f'''
 DELETE FROM data_integration_system_statistics
 WHERE timestamp + INTERVAL '{config.run_log_retention_in_days()} days' < current_timestamp;''')
+
+            self.node_output = None
\ No newline at end of file