diff --git a/app/scodoc/gen_tables.py b/app/scodoc/gen_tables.py
index a986494e..78a0f6a2 100644
--- a/app/scodoc/gen_tables.py
+++ b/app/scodoc/gen_tables.py
@@ -498,7 +498,7 @@ class GenTable(object):
             headline = []
         return "\n".join(
             [
-                self.text_fields_separator.join([x for x in line])
+                self.text_fields_separator.join([str(x) for x in line])
                 for line in headline + self.get_data_list()
             ]
         )