From f93cd857cbf10637c01040dfabebeef396b2d9ad Mon Sep 17 00:00:00 2001
From: Daniel Lee <dan.limerick@gmail.com>
Date: Thu, 21 Feb 2019 13:34:10 +0100
Subject: [PATCH] panel: defensive coding that fixes #15563

If a plugin incorrectly uses an attribute in the
query-editor-row directive, it should not throw
an exception.

(cherry picked from commit bd0f55cbb875b88a6986a70ee08a21fb44a757c6)
---
 public/app/features/panel/query_editor_row.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/public/app/features/panel/query_editor_row.ts b/public/app/features/panel/query_editor_row.ts
index fa25ce832be..3c44fab4db3 100644
--- a/public/app/features/panel/query_editor_row.ts
+++ b/public/app/features/panel/query_editor_row.ts
@@ -14,7 +14,7 @@ export class QueryRowCtrl {
     this.target = this.queryCtrl.target;
     this.panel = this.panelCtrl.panel;
 
-    if (this.hasTextEditMode) {
+    if (this.hasTextEditMode && this.queryCtrl.toggleEditorMode) {
       // expose this function to react parent component
       this.panelCtrl.toggleEditorMode = this.queryCtrl.toggleEditorMode.bind(this.queryCtrl);
     }