From 31657fe534bf0de64f75960954a0620877fa7320 Mon Sep 17 00:00:00 2001
From: Bertrand Songis <bsongis@gmail.com>
Date: Mon, 5 Oct 2020 23:16:34 +0200
Subject: [PATCH] Defense

---
 radio/src/thirdparty/libopenui/src/roller.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/radio/src/thirdparty/libopenui/src/roller.h b/radio/src/thirdparty/libopenui/src/roller.h
index 2a44db723..608eab033 100644
--- a/radio/src/thirdparty/libopenui/src/roller.h
+++ b/radio/src/thirdparty/libopenui/src/roller.h
@@ -70,6 +70,9 @@ class Roller: public Choice
     {
       int32_t value = getValue();
       auto valuesCount = getValuesCount();
+      if (valuesCount == 0) {
+        return;
+      }
 
       int index = (scrollPositionY - ROLLER_LINE_HEIGHT + 1)  / ROLLER_LINE_HEIGHT;
       coord_t y = index * ROLLER_LINE_HEIGHT;