diff --git a/sampling_methods/kcenter_greedy.py b/sampling_methods/kcenter_greedy.py
index ff7e548..d9b8a05 100644
--- a/sampling_methods/kcenter_greedy.py
+++ b/sampling_methods/kcenter_greedy.py
@@ -102,7 +102,7 @@ def select_batch_(self, model, already_selected, N, **kwargs):
     new_batch = []
 
     for _ in range(N):
-      if self.already_selected is None:
+      if self.min_distances is None:
         # Initialize centers with a randomly selected datapoint
         ind = np.random.choice(np.arange(self.n_obs))
       else: