diff --git a/cachalot/utils.py b/cachalot/utils.py
index 5102aa2..716c725 100644
--- a/cachalot/utils.py
+++ b/cachalot/utils.py
@@ -59,6 +59,7 @@ def check_parameter_types(params):
             elif cl is dict:
                 check_parameter_types(p.items())
             else:
+                print(params, [text_type(p) for p in params])
                 raise UncachableQuery