PoS Minting null exception (#1295)
PoS Minting null exception (#1295)

* null exception

* fixed typo

Aprogiena/StratisBitcoinFullNode,fassadlr/StratisBitcoinFullNode,mikedennis/StratisBitcoinFullNode,mikedennis/StratisBitcoinFullNode,stratisproject/StratisBitcoinFullNode,quantumagi/StratisBitcoinFullNode,bokobza/StratisBitcoinFullNode,bokobza/StratisBitcoinFullNode,fassadlr/StratisBitcoinFullNode,Neurosploit/StratisBitcoinFullNode,stratisproject/StratisBitcoinFullNode,mikedennis/StratisBitcoinFullNode,bokobza/StratisBitcoinFullNode,Aprogiena/StratisBitcoinFullNode,Neurosploit/StratisBitcoinFullNode,bokobza/StratisBitcoinFullNode,mikedennis/StratisBitcoinFullNode,Neurosploit/StratisBitcoinFullNode,quantumagi/StratisBitcoinFullNode,Aprogiena/StratisBitcoinFullNode