def on_header(self, i, r):
result = r.get('result')
- if not result: return
+ if not result:
+ return
height = result.get('block_height')
+ if not height:
+ return
self.heights[i.server] = height
self.merkle_roots[i.server] = result.get('merkle_root')
self.utxo_roots[i.server] = result.get('utxo_root')