From af47faa292f6603ada8228e78c0f55178c86eec9 Mon Sep 17 00:00:00 2001
From: Puja Sharma <pujasharma1908@gmail.com>
Date: Mon, 13 Sep 2021 10:31:55 +0530
Subject: [PATCH] XLSB formula parsing guard [ci skip]

---
 bits/62_fxls.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bits/62_fxls.js b/bits/62_fxls.js
index 62918ae..26520a0 100644
--- a/bits/62_fxls.js
+++ b/bits/62_fxls.js
@@ -891,7 +891,7 @@ function stringify_formula(formula/*Array<any>*/, range, cell/*:any*/, supbooks,
 					if(supbooks[bookidx] && supbooks[bookidx][nameidx]) o += supbooks[bookidx][nameidx].Name;
 					else if(supbooks[0] && supbooks[0][nameidx]) o += supbooks[0][nameidx].Name;
 					else {
-						var ixtidata = get_ixti_raw(supbooks, bookidx, opts).split(";;");
+						var ixtidata = (get_ixti_raw(supbooks, bookidx, opts)||"").split(";;");
 						if(ixtidata[nameidx - 1]) o = ixtidata[nameidx - 1]; // TODO: confirm this is correct
 						else o += "SH33TJSERRX";
 					}