fix nodes panic during synchronization #3837

Job	Run time
Basic Checks	3m 4s
Unit Tests	7m 53s
Integration Tests (raft)	13m 3s
Integration Tests (pvtdata)	12m 6s
Integration Tests (pvtdatapurge e2e)	11m 51s
Integration Tests (ledger)	13m 39s
Integration Tests (lifecycle)	6m 6s
Integration Tests (smartbft)	20m 55s
Integration Tests (discovery gossip devmode pluggable)	5m 52s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	16m 27s
Integration Tests (sbe nwo msp)	8m 11s
	1h 59m 7s

Provide feedback