diff --git a/superset/views/core.py b/superset/views/core.py
index 48f832473..b566c775b 100755
--- a/superset/views/core.py
+++ b/superset/views/core.py
@@ -401,7 +401,7 @@ class CsvToDatabaseView(SimpleFormView):
             except OSError:
                 pass
             message = 'Table name {} already exists. Please pick another'.format(
-                form.name.data) if isinstance(e, IntegrityError) else e
+                form.name.data) if isinstance(e, IntegrityError) else str(e)
             flash(
                 message,
                 'danger')