From 6a5f330b3b219f580d7de160847520607714c861 Mon Sep 17 00:00:00 2001
From: hius07 <62179190+hius07@users.noreply.github.com>
Date: Sat, 8 Jan 2022 08:39:13 +0200
Subject: [PATCH] Fix djvu crash on long-press on scanned text (#8626)

---
 frontend/document/koptinterface.lua | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/frontend/document/koptinterface.lua b/frontend/document/koptinterface.lua
index 2a51428b8..078893ade 100644
--- a/frontend/document/koptinterface.lua
+++ b/frontend/document/koptinterface.lua
@@ -668,7 +668,9 @@ function KoptInterface:getNativeTextBoxesFromScratch(doc, pageno)
         local page = doc._document:openPage(pageno)
         page:getPagePix(kc)
         local boxes, nr_word = kc:getNativeWordBoxes("src", 0, 0, page_size.w, page_size.h)
-        DocCache:insert(hash, CacheItem:new{ scratchnativepgboxes = boxes, size = 192 * nr_word }) -- estimation
+        if boxes then
+            DocCache:insert(hash, CacheItem:new{ scratchnativepgboxes = boxes, size = 192 * nr_word }) -- estimation
+        end
         page:close()
         kc:free()
         return boxes