From ad8ec54ca9858c74dcf3be28f16ab4605ab855ae Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 5 Jan 2023 15:45:11 +0100
Subject: [statistics] Fix graph background if there are no lectures

---
 modules-available/statistics/templates/summary.html | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules-available/statistics/templates/summary.html b/modules-available/statistics/templates/summary.html
index 461b4423..a0efd531 100644
--- a/modules-available/statistics/templates/summary.html
+++ b/modules-available/statistics/templates/summary.html
@@ -30,6 +30,7 @@
 
 				var markings = {{{markings}}};
 				var markMax = Math.max(...markings) * 3;
+				if (markMax <= 0) markMax = 1;
 
 				var oldDraw = Chart.prototype._drawDatasets;
 
-- 
cgit v1.2.3-55-g7522