From 38838a6d0b66888a1e8569602be3ff903bdb9780 Mon Sep 17 00:00:00 2001
From: Damien Elmes <gpg@ankiweb.net>
Date: Wed, 1 Jul 2020 13:32:01 +1000
Subject: [PATCH] fix invalid cumulative path when no data available

---
 ts/src/stats/histogram-graph.ts | 2 +-
 ts/src/stats/reviews.ts         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/ts/src/stats/histogram-graph.ts b/ts/src/stats/histogram-graph.ts
index 628218441..86806df44 100644
--- a/ts/src/stats/histogram-graph.ts
+++ b/ts/src/stats/histogram-graph.ts
@@ -102,7 +102,7 @@ export function histogramGraph(
     const areaData = cumsum(areaCounts);
     const yAreaScale = y.copy().domain([0, data.total]);
 
-    if (data.showArea && data.bins.length) {
+    if (data.showArea && data.bins.length && areaData.slice(-1)[0]) {
         svg.select("path.area")
             .datum(areaData as any)
             .attr(
diff --git a/ts/src/stats/reviews.ts b/ts/src/stats/reviews.ts
index a725a9499..6ce9bc790 100644
--- a/ts/src/stats/reviews.ts
+++ b/ts/src/stats/reviews.ts
@@ -309,7 +309,7 @@ export function renderReviews(
     const areaData = cumsum(areaCounts);
     const yAreaScale = y.copy().domain([0, areaData.slice(-1)[0]]);
 
-    if (bins.length) {
+    if (areaData.slice(-1)[0]) {
         svg.select("path.area")
             .datum(areaData as any)
             .attr(