From 8f5691d58616afca9857f7c2601c7eee735c66b0 Mon Sep 17 00:00:00 2001
From: chrox <chrox.huang@gmail.com>
Date: Thu, 6 Nov 2014 11:18:04 +0800
Subject: [PATCH] fix #968 by check the nullity of text range

---
 frontend/document/credocument.lua | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/frontend/document/credocument.lua b/frontend/document/credocument.lua
index c644696cf..45f1bc44e 100644
--- a/frontend/document/credocument.lua
+++ b/frontend/document/credocument.lua
@@ -184,13 +184,15 @@ end
 function CreDocument:getTextFromPositions(pos0, pos1)
     local text_range = self._document:getTextFromPositions(pos0.x, pos0.y, pos1.x, pos1.y)
     DEBUG("CreDocument: get text range", text_range)
-    local line_boxes = self:getScreenBoxesFromPositions(text_range.pos0, text_range.pos1)
-    return {
-        text = text_range.text,
-        pos0 = text_range.pos0,
-        pos1 = text_range.pos1,
-        --sboxes = line_boxes,     -- boxes on screen
-    }
+    if text_range then
+        local line_boxes = self:getScreenBoxesFromPositions(text_range.pos0, text_range.pos1)
+        return {
+            text = text_range.text,
+            pos0 = text_range.pos0,
+            pos1 = text_range.pos1,
+            --sboxes = line_boxes,     -- boxes on screen
+        }
+    end
 end
 
 function CreDocument:getScreenBoxesFromPositions(pos0, pos1)