diff --git a/pyxtal/__init__.py b/pyxtal/__init__.py
index 34be6b57..ee46aff7 100644
--- a/pyxtal/__init__.py
+++ b/pyxtal/__init__.py
@@ -1966,7 +1966,7 @@ def get_transition(self, ref_struc, d_tol=1.0, d_tol2=0.3, N_images=2, max_path=
             if Skipped > 0:
                 print("Warning: ignore some solutions: ", Skipped)
                        
-        return None, None, None, None
+            return None, None, None, p
 
     def get_transition_by_path(self, ref_struc, path, d_tol, d_tol2=0.5, N_images=2):
         """