Added fix

cell/model/FormulaObjects/lookupandreferenceFunctions.js

@@ -1574,19 +1574,19 @@ function (window, undefined) {
 			let dimension = arg0.getDimensions();
 			let isSingleRowCol = (dimension.row > 1 && dimension.col > 1) ? false : true;
 			let isByColumn = (dimension.row > 1) ? true : false;
+			let isArray = cElementType.array === arg0.type;
 
 			let diffArg1 = arg1 === 0 ? 0 : 1;
 			let diffArg2 = arg2 === 0 ? 0 : 1;
 
 			if (arg[2] !== undefined && (arg1 > dimension.row || arg2 > dimension.col)) {
 				/* if the col_num and row_num in the arguments is greater than the array size, return an error */
 				res = new cError(cErrorType.bad_reference);
-			} else if (arg[2] === undefined && !isSingleRowCol) {
-				/* if the second arg is ommited and array is two dimensional, return an error */
+			} else if (!isArray && arg[2] === undefined && !isSingleRowCol) {
+				/* if the second arg is ommited and range(exactly reference) is two dimensional, return an error */
 				res = new cError(cErrorType.bad_reference);
 			} else if (cElementType.array === arg0.type || cElementType.cellsRange === arg0.type) {
 				let ws = arg0.getWS ? arg0.getWS() : null, bbox = arg0.getBBox0 ? arg0.getBBox0() : null;
-				let isArray = cElementType.array === arg0.type;
 
 				if (!isSingleRowCol) {
 					/* r&c > 1 */

tests/cell/spreadsheet-calculation/FormulaTests.js

@@ -23359,6 +23359,24 @@ $(function () {
 		oParser = new parserFormula('INDEX({"Apples","Lemons";"Apple","Lemon"},3,2)', "A2", ws);
 		assert.ok(oParser.parse());
 		assert.strictEqual(oParser.calculate().getValue(), "#REF!");
+
+		ws.getRange2("A100").setValue("1")
+		ws.getRange2("B100").setValue("2")
+		ws.getRange2("A101").setValue("3")
+		ws.getRange2("B101").setValue("4")
+
+		// the behavior with array and range is different in these case(when arg2 is ommited)
+		oParser = new parserFormula('INDEX({1,2;3,4},)', "A2", ws);
+		assert.ok(oParser.parse());
+		array = oParser.calculate();
+		assert.strictEqual(array.getElementRowCol(0, 0).getValue(), 1, 'Result of INDEX({1,2;3,4},)[0,0]');
+		assert.strictEqual(array.getElementRowCol(1, 0).getValue(), 3, 'Result of INDEX({1,2;3,4},)[1,0]');
+		assert.strictEqual(array.getElementRowCol(0, 1).getValue(), 2, 'Result of INDEX({1,2;3,4},)[0,1]');
+		assert.strictEqual(array.getElementRowCol(1, 1).getValue(), 4, 'Result of INDEX({1,2;3,4},)[1,1]');
+
+		oParser = new parserFormula('INDEX(A100:B101,)', "A2", ws);
+		assert.ok(oParser.parse());
+		assert.strictEqual(oParser.calculate().getValue(), "#REF!");
 
 	});