diff --git a/pybtc/connector.py b/pybtc/connector.py
index 28f17b0..fcb4587 100644
--- a/pybtc/connector.py
+++ b/pybtc/connector.py
@@ -412,7 +412,8 @@ class Connector:
         if self.block_cache.get(block["hash"]) is not None:
                 self.log.error("duplicated block  %s" % block["hash"])
                 raise Exception("duplicated block")
-
+        if "previousblockhash" not in block:
+            return
         if self.block_cache.get_last() != block["previousblockhash"]:
             if self.block_cache.get(block["previousblockhash"]) is None and self.last_block_height:
                 self.log.critical("Connector error! Node out of sync "