diff --git a/nautilus_trader/data/aggregation.pyx b/nautilus_trader/data/aggregation.pyx
index 1fdf79ea5156..5cbbfde4bdaa 100644
--- a/nautilus_trader/data/aggregation.pyx
+++ b/nautilus_trader/data/aggregation.pyx
@@ -657,7 +657,6 @@ cdef class TimeBarAggregator(BarAggregator):
         Stop the bar aggregator.
         """
         self._clock.cancel_timer(str(self.bar_type))
-        self._timer_name = None
 
     cdef timedelta _get_interval(self):
         cdef BarAggregation aggregation = self.bar_type.spec.aggregation