kademlia: check prox in AddNodeRecord not to try insert Self in non-existing row

common/kademlia/kademlia.go

@@ -304,10 +304,12 @@ func (self *Kademlia) AddNodeRecords(nrs []*NodeRecord) {
 		if !found {
 			self.nodeIndex[node.Address] = node
 			index := proximity(self.addr, node.Address)
+			if index < len(self.nodeDB) {
 				self.nodeDB[index] = append(self.nodeDB[index], node)
 			}
 		}
 	}
+}
 
 /*
 GetNodeRecord gives back a node record with the highest priority for desired