From 0222af023dc5c5b0bdb3b1c6b3721c282c5eaf25 Mon Sep 17 00:00:00 2001
From: Ryan Leung <rleungx@gmail.com>
Date: Thu, 23 Nov 2023 17:38:42 +0800
Subject: [PATCH] schedule: fix panic when switching placement rules (#7415)

close tikv/pd#7414

Signed-off-by: Ryan Leung <rleungx@gmail.com>

Co-authored-by: ti-chi-bot[bot] <108142056+ti-chi-bot[bot]@users.noreply.github.com>
---
 pkg/schedule/checker/rule_checker.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkg/schedule/checker/rule_checker.go b/pkg/schedule/checker/rule_checker.go
index 08ef5f7b45c..553ece09e65 100644
--- a/pkg/schedule/checker/rule_checker.go
+++ b/pkg/schedule/checker/rule_checker.go
@@ -132,6 +132,11 @@ func (c *RuleChecker) CheckWithFit(region *core.RegionInfo, fit *placement.Regio
 		return
 	}
 
+	// the placement rule is disabled
+	if fit == nil {
+		return
+	}
+
 	// If the fit is calculated by FitRegion, which means we get a new fit result, thus we should
 	// invalid the cache if it exists
 	c.ruleManager.InvalidCache(region.GetID())