From 776275c52b5d918b127a62cb4f059eedbbb5eb5b Mon Sep 17 00:00:00 2001
From: Paul Bienkowski <pb@opatut.de>
Date: Fri, 3 Dec 2021 18:12:00 +0100
Subject: [PATCH] fix: clicking on road without events should not cause 500
 error

---
 api/obs/api/routes/mapdetails.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/api/obs/api/routes/mapdetails.py b/api/obs/api/routes/mapdetails.py
index e18ea2e..d34c9b1 100644
--- a/api/obs/api/routes/mapdetails.py
+++ b/api/obs/api/routes/mapdetails.py
@@ -84,6 +84,9 @@ async def mapdetails_road(req):
 
     arrays = numpy.array(arrays).T.astype(numpy.float64)
 
+    if len(arrays) == 0:
+        arrays = numpy.array([[], [], []])
+
     def array_stats(arr, rounder):
         arr = arr[~numpy.isnan(arr)]
         n = len(arr)