diff --git a/src/sql/workbench/api/common/sqlExtHostTypes.ts b/src/sql/workbench/api/common/sqlExtHostTypes.ts
index 43cb19f8f1..cdebe8940d 100644
--- a/src/sql/workbench/api/common/sqlExtHostTypes.ts
+++ b/src/sql/workbench/api/common/sqlExtHostTypes.ts
@@ -549,7 +549,7 @@ export class CellRange {
 	}
 
 	constructor(start: number, end: number) {
-		if (typeof (start) !== 'number' || typeof (start) !== 'number' || start < 0 || end < 0) {
+		if (typeof (start) !== 'number' || typeof (end) !== 'number' || start < 0 || end < 0) {
 			throw new Error('Invalid arguments');
 		}