diff --git a/tofu/imas2tofu/_core.py b/tofu/imas2tofu/_core.py
index 44440a544..da640dc47 100644
--- a/tofu/imas2tofu/_core.py
+++ b/tofu/imas2tofu/_core.py
@@ -2699,7 +2699,14 @@ def _to_Cam_Du(self, ids, lk, indch, nan=None, pos=None):
             u = np.array([oo[:,1,0]*np.cos(oo[:,1,2]),
                           oo[:,1,0]*np.sin(oo[:,1,2]), oo[:,1,1]])
             u = (u-D) / np.sqrt(np.sum((u-D)**2, axis=0))[None,:]
-            dgeom = (D,u)
+            dgeom = (D, u)
+            indnan = np.any(np.isnan(D), axis=0) | np.any(np.isnan(u), axis=0)
+            if np.any(indnan):
+                nunav, ntot = str(indnan.sum()), str(D.shape[1])
+                msg = "Some lines of sight geometry unavailable in ids:\n"
+                msg += "    - unavailable LOS: {0} / {1}\n".format(nunav, ntot)
+                msg += "    - indices: {0}".format(str(indnan.nonzero()[0]))
+                warnings.warn(msg)
         else:
             dgeom = None
 
@@ -2935,6 +2942,7 @@ def to_Data(self, ids=None, dsig=None, data=None, X=None, tlim=None,
                                             dchans=dchans)
                 cam.Id.set_dUSR( {'imas-nchMax': nchMax} )
 
+
         # -----------------------
         # data
         lk = sorted(dsig.keys())
diff --git a/tofu/utils.py b/tofu/utils.py
index 9b78bde8b..38a54167a 100644
--- a/tofu/utils.py
+++ b/tofu/utils.py
@@ -1451,11 +1451,13 @@ def _get_summary(cls, lar, lcol,
         # pass
 
     def __repr__(self):
-        if hasattr(self, 'get_summary'):
-            return self.get_summary(return_='msg', verb=False)
-        else:
-            return object.__repr__(self)
-
+        try:
+            if hasattr(self, 'get_summary'):
+                return self.get_summary(return_='msg', verb=False)
+            else:
+                return object.__repr__(self)
+        except Exception:
+            return self.__class__.__name__
 
     #############################
     #  strip and to/from dict
diff --git a/tofu/version.py b/tofu/version.py
index 9b4e6a6dc..3a178e146 100644
--- a/tofu/version.py
+++ b/tofu/version.py
@@ -1,2 +1,2 @@
 # Do not edit, pipeline versioning governed by git tags!
-__version__ = '1.4.1-177-g5b98902'
+__version__ = '1.4.1-190-gd25622d'