diff --git a/src/sql/parts/query/execution/queryRunner.ts b/src/sql/parts/query/execution/queryRunner.ts
index 2e7c6f1808..03cdfd3ea6 100644
--- a/src/sql/parts/query/execution/queryRunner.ts
+++ b/src/sql/parts/query/execution/queryRunner.ts
@@ -184,6 +184,7 @@ export default class QueryRunner {
 		this._echoedResultSet.clear();
 		this._debouncedMessage.clear();
 		this._debouncedResultSet.clear();
+		this._planXml = new Deferred<string>();
 		let ownerUri = this.uri;
 		this._batchSets = [];
 		this._hasCompleted = false;