diff --git a/tofu/imas2tofu/_comp.py b/tofu/imas2tofu/_comp.py
index 119672129..aeb6d2e6e 100644
--- a/tofu/imas2tofu/_comp.py
+++ b/tofu/imas2tofu/_comp.py
@@ -217,7 +217,15 @@ def fsig(obj, indt=None, indch=None, stack=None, dcond=dcond):
                             raise Exception(msg)
 
                     if len(ind) == 1:
-                        sig[jj] = sig[jj][ind[0]]
+                        # DB
+                        try:
+                            sig[jj] = sig[jj][ind[0]]
+                        except Exception as err:
+                            print()
+                            print(ii, jj)
+                            print(ind)
+                            print(sig[jj])
+                            raise err
                     else:
                         if nsig != 1:
                             msg = ("nsig should be 1!\n"