兼容性问题

src/controllers/sheetmanage.js

@@ -1004,7 +1004,7 @@ const sheetmanage = {
 			rowheight = r2 + 1;
 		}
 
-		let colwidth = data[0].length;
+		let colwidth = data[0] ? data[0].length : 0;
 		if (c2 > colwidth - 1) {
 			colwidth = c2 + 1;
 		}