diff --git a/frontend/apps/reader/modules/readerfooter.lua b/frontend/apps/reader/modules/readerfooter.lua
index 7fc2e9a8a..44645222d 100644
--- a/frontend/apps/reader/modules/readerfooter.lua
+++ b/frontend/apps/reader/modules/readerfooter.lua
@@ -242,11 +242,13 @@ end
 
 function ReaderFooter:getDataFromStatistics(title, pages)
     local statistics_data = self.ui.doc_settings:readSetting("stats")
+    local sec = 'na'
     if statistics_data and statistics_data.performance_in_pages then
         local read_pages = util.tablelength(statistics_data.performance_in_pages)
         local average_time_per_page = statistics_data.total_time_in_sec / read_pages
-        return title .. util.secondsToClock(pages * average_time_per_page, true)
+        sec = util.secondsToClock(pages * average_time_per_page, true)
     end
+    return title .. sec
 end
 
 
diff --git a/frontend/apps/reader/readerui.lua b/frontend/apps/reader/readerui.lua
index 659917b3b..4693adce7 100644
--- a/frontend/apps/reader/readerui.lua
+++ b/frontend/apps/reader/readerui.lua
@@ -327,7 +327,12 @@ function ReaderUI:showReader(file)
         local co = coroutine.create(function()
             self:doShowReader(file)
         end)
-        coroutine.resume(co)
+        local ok, err = coroutine.resume(co)
+        if err ~= nil then
+            print '[!] doShowReader coroutine crashed:'
+            print(debug.traceback(co, err, 1))
+            UIManager._running = false
+        end
     end)
 end