diff --git a/tofu/geom/_core_Optics.py b/tofu/geom/_core_Optics.py
index <HASH>..<HASH> 100644
--- a/tofu/geom/_core_Optics.py
+++ b/tofu/geom/_core_Optics.py
@@ -567,7 +567,7 @@ class CrystalBragg(utils.ToFuObject):
         Z = float(Z)
 
         frame_cent = np.atleast_1d(frame_cent).ravel()
-        assert frame_cent.size == 2
+        ssue202_SpectroX2DCrystalassert frame_cent.size == 2
         frame_ang = float(frame_ang)
 
         ang_bragg = np.atleast_1d(ang_bragg).ravel()
[Issue<I>] Tested, about to merge with Issue<I>