From 1e7357db8026346c8d4651c8b5b969eed9df04c0 Mon Sep 17 00:00:00 2001
From: matejcik <ja@matejcik.cz>
Date: Thu, 18 Apr 2019 15:03:24 +0200
Subject: [PATCH] core/ui: fix crash when trying to scroll with only one page

---
 core/src/trezor/ui/scroll.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/src/trezor/ui/scroll.py b/core/src/trezor/ui/scroll.py
index 89d2fad39b..d144f76d7c 100644
--- a/core/src/trezor/ui/scroll.py
+++ b/core/src/trezor/ui/scroll.py
@@ -21,9 +21,9 @@ async def change_page(page, page_count):
         else:
             s = await swipe
         if s == SWIPE_UP:
-            return page + 1  # scroll down
+            return min(page + 1, page_count - 1)  # scroll down
         elif s == SWIPE_DOWN:
-            return page - 1  # scroll up
+            return max(page - 1, 0)  # scroll up
 
 
 async def paginate(render_page, page_count, page=0, *args):