SIGSEGV when enabling --log_level=debug

[quaisx]

When running a cosmos-sdk app and setting the log level: --log_level=debug, the code crashes on tree.logger.Debug("recursiveRemove", "node", node, "key", key)

github.com/cosmos/iavl.(*MutableTree).recursiveRemove() /home/quaisx/go/pkg/mod/github.com/cosmos/iavl@v1.0.1/mutable_tree.go:363 (PC: 0x26ce542)
Warning: debugging optimized function
   358:	// - the hash of the new node (or nil if the node is the one removed)
   359:	// - the node that replaces the orig. node after remove
   360:	// - new leftmost leaf key for tree after successfully removing 'key' if changed.
   361:	// - the removed value
   362:	func (tree *MutableTree) recursiveRemove(node *Node, key []byte) (newSelf *Node, newKey []byte, newValue []byte, removed bool, err error) {
=> 363:		tree.logger.Debug("recursiveRemove", "node", node, "key", key)
   364:		if node.isLeaf() {
   365:			if bytes.Equal(key, node.key) {
   366:				return nil, nil, node.value, true, nil
   367:			}
   368:			return node, nil, nil, false, nil
(dlv) p node
("*github.com/cosmos/iavl.Node")(0xc0012357c0)
*github.com/cosmos/iavl.Node {
	key: []uint8 len: 22, cap: 24, [33,20,69,20,243,229,195,245,64,51,143,231,245,52,119,47,66,155,170,166,251,226],
	value: []uint8 len: 0, cap: 0, nil,
	hash: []uint8 len: 0, cap: 0, nil,
	nodeKey: *github.com/cosmos/iavl.NodeKey nil,
	leftNodeKey: []uint8 len: 0, cap: 0, nil,
	rightNodeKey: []uint8 len: 0, cap: 0, nil,
	size: 4,
	leftNode: *github.com/cosmos/iavl.Node {
		key: []uint8 len: 1, cap: 8, [18],
		value: []uint8 len: 0, cap: 0, nil,
		hash: []uint8 len: 0, cap: 0, nil,
		nodeKey: *github.com/cosmos/iavl.NodeKey nil,
		leftNodeKey: []uint8 len: 0, cap: 0, nil,
		rightNodeKey: []uint8 len: 0, cap: 0, nil,
		size: 2,
		leftNode: *(*"github.com/cosmos/iavl.Node")(0xc0012350e0),
		rightNode: *(*"github.com/cosmos/iavl.Node")(0xc001235180),
		subtreeHeight: 1,},
	rightNode: *github.com/cosmos/iavl.Node {
		key: []uint8 len: 22, cap: 24, [34,20,183,112,254,171,62,25,150,90,82,78,184,150,182,94,23,80,241,33,79,144],
		value: []uint8 len: 0, cap: 0, nil,
		hash: []uint8 len: 0, cap: 0, nil,
		nodeKey: *github.com/cosmos/iavl.NodeKey nil,
		leftNodeKey: []uint8 len: 0, cap: 0, nil,
		rightNodeKey: []uint8 len: 0, cap: 0, nil,
		size: 2,
		leftNode: *(*"github.com/cosmos/iavl.Node")(0xc001235360),
		rightNode: *(*"github.com/cosmos/iavl.Node")(0xc0012355e0),
		subtreeHeight: 1,},
	subtreeHeight: 2,}

String() implementation on nil node.value causes SIGSEGV

github.com/cosmos/iavl.(*Node).String() /home/quaisx/go/pkg/mod/github.com/cosmos/iavl@v1.0.1/node.go:284 (PC: 0x26d36a6)
Warning: debugging optimized function
   279:		}
   280:		if node.rightNode != nil && node.rightNode.nodeKey != nil {
   281:			child += fmt.Sprintf("{right %v}", node.rightNode.nodeKey)
   282:		}
   283:		return fmt.Sprintf("Node{%s:%s@ %v:%v-%v %d-%d}#%s\n",
=> 284:			color.ColoredBytes(node.key, color.Green, color.Blue),
   285:			color.ColoredBytes(node.value, color.Cyan, color.Blue),
   286:			node.nodeKey, node.leftNodeKey, node.rightNodeKey,
   287:			node.size, node.subtreeHeight, child)
   288:	}
   289:	
(dlv) p node.key
[]uint8 len: 22, cap: 24, [33,20,69,20,243,229,195,245,64,51,143,231,245,52,119,47,66,155,170,166,251,226]
(dlv) p node.value
[]uint8 len: 0, cap: 0, nil