diff --git a/eea/facetednavigation/criteria/handler.py b/eea/facetednavigation/criteria/handler.py
index 6f455613..6a457672 100644
--- a/eea/facetednavigation/criteria/handler.py
+++ b/eea/facetednavigation/criteria/handler.py
@@ -153,6 +153,8 @@ def edit(self, cid, **properties):
         for key, value in properties.items():
             if key not in schema:
                 continue
+            if not value:
+                continue
             if isinstance(value, (list, tuple)):
                 value_type = schema[key].value_type
                 value = [fix_string(x) for x in value]