diff --git a/tailbone/grids/filters.py b/tailbone/grids/filters.py
index 26ef4f59..59e20d78 100644
--- a/tailbone/grids/filters.py
+++ b/tailbone/grids/filters.py
@@ -271,7 +271,8 @@ class GridFilter(object):
         value = self.get_value(value)
         filtr = getattr(self, 'filter_{0}'.format(verb), None)
         if not filtr:
-            raise ValueError("Unknown filter verb: {0}".format(repr(verb)))
+            log.warning("unknown filter verb: %s", verb)
+            return data
         return filtr(data, value)
 
     def get_value(self, value=UNSPECIFIED):