Fix for calculating the current position in the case of TOC containing links to external files:

when walking the TOC we should check if the destination page is within the range of the current document.

unireader.lua

@@ -1740,10 +1740,11 @@ end
 -- corresponding to the current page.
 function UniReader:findTOCpos()
 	local pos, found_pos = 0, false
+	local numpages = self.doc:getPages()
 
 	-- find the index into toc_xview first
 	for k,v in ipairs(self.toc) do
-		if v.page > self.pageno then
+		if v.page >= 1 and v.page <= self.doc:getPages() and v.page > self.pageno then
 			pos = k - 1
 			found_pos = true
 			break