diff --git a/domhmm/analysis/domhmm.py b/domhmm/analysis/domhmm.py
index 3aba332..4780936 100644
--- a/domhmm/analysis/domhmm.py
+++ b/domhmm/analysis/domhmm.py
@@ -863,7 +863,7 @@ def getis_ord_stat(self, weight_matrix_all, leaflet):
             # In case the code was already executed beforehand
             weight_matrix[range(n), range(n)] = 0.
 
-            if not any(cluster_group):
+            if not any(self.cluster_group):
                 # Get the order state of each lipid in the leaflet at the current time step
                 order_states = self.get_leaflet_step_order(leaflet=leaflet, step=step)
             else: