diff --git a/ganimation/solver.py b/ganimation/solver.py
index 2e6611b..2cce867 100644
--- a/ganimation/solver.py
+++ b/ganimation/solver.py
@@ -412,7 +412,7 @@ class Solver(Utils):
                 if idx == 0:
                     for target_idx in range(targets.size(0)):
                         x_adv, perturb = pgd_attack.perturb_iter_class(image_to_animate, black, targets[target_idx, :].unsqueeze(0).cuda())
-                        x_advs.append(x_adv, perturb)
+                        x_advs.append((x_adv, perturb))
 
                 for target_idx in range(targets.size(0)):
                     # if target_idx == 0: