Bug Report: invalid memory address or nil pointer dereference

[WALL-E]

Summary of Bug

Multiple runtime errors

Steps to Reproduce

1. start tendermint node

2. start kvstore in cosmos/example

3. open url: http://tendermint-node-ip:26657/abci_query?path="custom"

[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x17e516f]

goroutine 37 [running]:
github.com/cosmos/cosmos-sdk/baseapp.handleQueryCustom(0xc00024fd10, 0xc000934060, 0x2, 0x2, 0x0, 0x0, 0x0, 0xc000932240, 0x7, 0x0, ...)
   /workspace/cosmos-sdk/baseapp/baseapp.go:399 +0x2cf
github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).Query(0xc00024fd10, 0x0, 0x0, 0x0, 0xc000932240, 0x7, 0x0, 0x1, 0x0, 0x0, ...)
   /workspace/cosmos-sdk/baseapp/baseapp.go:311 +0x327
github.com/tendermint/tendermint/abci/server.(*SocketServer).handleRequest(0xc0000b2c80, 0xc00019b080, 0xc000196600)
   /workspace/gocode/pkg/mod/github.com/tendermint/tendermint@v0.25.0/abci/server/socket_server.go:190 +0xd7b
github.com/tendermint/tendermint/abci/server.(*SocketServer).handleRequests(0xc0000b2c80, 0xc0001965a0, 0x1beacc0, 0xc0001b60b0, 0xc000196600)
   /workspace/gocode/pkg/mod/github.com/tendermint/tendermint@v0.25.0/abci/server/socket_server.go:163 +0xe5
created by github.com/tendermint/tendermint/abci/server.(*SocketServer).acceptConnectionsRoutine
   /workspace/gocode/pkg/mod/github.com/tendermint/tendermint@v0.25.0/abci/server/socket_server.go:119 +0x269

Process finished with exit code 2

4. open url: http://tendermint-node-ip:26657/abci_query?path="custom/name"

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x17e516f]

goroutine 22 [running]:
github.com/cosmos/cosmos-sdk/baseapp.handleQueryCustom(0xc00024ee10, 0xc0010e6760, 0x2, 0x2, 0x0, 0x0, 0x0, 0xc0001ef970, 0xb, 0x0, ...)
	/workspace/cosmos-sdk/baseapp/baseapp.go:399 +0x2cf
github.com/cosmos/cosmos-sdk/baseapp.(*BaseApp).Query(0xc00024ee10, 0x0, 0x0, 0x0, 0xc0001ef970, 0xb, 0x0, 0x1, 0x0, 0x0, ...)
	/workspace/cosmos-sdk/baseapp/baseapp.go:311 +0x327
github.com/tendermint/tendermint/abci/server.(*SocketServer).handleRequest(0xc0000c28c0, 0xc00108c0c0, 0xc0000b6840)
	/workspace/gocode/pkg/mod/github.com/tendermint/tendermint@v0.25.0/abci/server/socket_server.go:190 +0xd7b
github.com/tendermint/tendermint/abci/server.(*SocketServer).handleRequests(0xc0000c28c0, 0xc0000b67e0, 0x1beacc0, 0xc0001c20c0, 0xc0000b6840)
	/workspace/gocode/pkg/mod/github.com/tendermint/tendermint@v0.25.0/abci/server/socket_server.go:163 +0xe5
created by github.com/tendermint/tendermint/abci/server.(*SocketServer).acceptConnectionsRoutine
	/workspace/gocode/pkg/mod/github.com/tendermint/tendermint@v0.25.0/abci/server/socket_server.go:119 +0x269

Process finished with exit code 2