diff --git a/nummi/main/views.py b/nummi/main/views.py
index f26fee3..e4fe9c2 100644
--- a/nummi/main/views.py
+++ b/nummi/main/views.py
@@ -178,7 +178,7 @@ def snapshot(request, uuid=None):
         )
         context["cat_lim"] = max(
             map(
-                abs,
+                lambda x: abs(x) if x else 0,
                 context["categories"]
                 .aggregate(
                     max=models.Max("sum_p"),