If the values passed to the ClassFunction constructor are already a l…

…ibgap

GapElement, keep with the ClassFunction_libgap implementation.

Otherwise everything goes haywire.

src/sage/groups/class_function.py

@@ -68,6 +68,9 @@ class function on the conjugacy classes, in that order.
     except AttributeError:
         pass
 
+    if isinstance(values, LibGapElement):
+        return ClassFunction_libgap(group, values)
+
     return ClassFunction_gap(group, values)