From 4aebfa66d50d73cb8c2f18d82249106bd3e07af4 Mon Sep 17 00:00:00 2001
From: khanh <50263489+catShaark@users.noreply.github.com>
Date: Thu, 2 Jun 2022 15:49:35 +0700
Subject: [PATCH] fix: use empty map instead of nil value for setting
 BaseApp.snapshotManager.extensions  (#12031)

## Description

`BaseApp` method `SetSnapshot` sets `BaseApp.snapshotManager.extensions` with a nil value, this will cause nil map error whenever `BaseApp.snapshotManager.extensions` is used, so I change it to an empty map instead.

### Author Checklist

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please add links to any relevant follow up issues.*

I have...

- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [x] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#pr-targeting))
- [x] provided a link to the relevant issue or specification
- [x] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [x] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [x] updated the relevant documentation or specification
- [x] reviewed "Files changed" and left comments if necessary
- [x] confirmed all CI checks have passed

### Reviewers Checklist

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I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)
---
 snapshots/manager.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/snapshots/manager.go b/snapshots/manager.go
index 8d10dcc9c713..dbca39ea2be7 100644
--- a/snapshots/manager.go
+++ b/snapshots/manager.go
@@ -70,6 +70,9 @@ var ErrOptsZeroSnapshotInterval = errors.New("snaphot-interval must not be 0")
 
 // NewManager creates a new manager.
 func NewManager(store *Store, opts types.SnapshotOptions, multistore types.Snapshotter, extensions map[string]types.ExtensionSnapshotter, logger log.Logger) *Manager {
+	if extensions == nil {
+		extensions = map[string]types.ExtensionSnapshotter{}
+	}
 	return &Manager{
 		store:      store,
 		opts:       opts,