From 08593c69437930855aefcb28d72772726947970a Mon Sep 17 00:00:00 2001
From: Glenn Washburn <development@efficientek.com>
Date: Sat, 30 Mar 2024 03:43:05 -0400
Subject: [PATCH] Fix NaN values in MCU when clicking "Set DC" while no value
 is in custom input box

---
 JPEGVisualRepairTool.html | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/JPEGVisualRepairTool.html b/JPEGVisualRepairTool.html
index d097d8f..bc2d387 100644
--- a/JPEGVisualRepairTool.html
+++ b/JPEGVisualRepairTool.html
@@ -891,7 +891,10 @@ <H2 style="display:inline">JPEG visual repair tool v1.3 (Oct '23)</H2> by Albert
 		undoList.push({action: "DC", position: selectedMCU.i, cell: structuredClone(MCUarray[selectedMCU.i])});
 		if(value==0){
 			var newDC=parseInt(document.getElementById("dcVal").value);
-			if(document.getElementById("layer").value=="Y"){
+			if (Number.isNaN(parseInt(newDC))) {
+				; // no value or invalid value
+			}
+			else if(document.getElementById("layer").value=="Y"){
 				MCUarray[selectedMCU.i].blocks[0].coeff[0]=newDC;
 			}
 			else if(document.getElementById("layer").value=="C1"){