diff --git a/kallithea/controllers/changeset.py b/kallithea/controllers/changeset.py
--- a/kallithea/controllers/changeset.py
+++ b/kallithea/controllers/changeset.py
@@ -75,7 +75,10 @@ def get_ignore_ws(fid, GET):
     ig_ws_global = GET.get('ignorews')
     ig_ws = filter(lambda k: k.startswith('WS'), GET.getall(fid))
     if ig_ws:
-        return int(ig_ws[0].split(':')[-1])
+        try:
+            return int(ig_ws[0].split(':')[-1])
+        except ValueError:
+            raise HTTPBadRequest()
     return ig_ws_global