fix panic

web3_proxy/src/rpcs/one.rs

@@ -995,10 +995,8 @@ impl Web3Rpc {
                                     .await?;
                                 }
                                 Ok(Some(block)) => {
+                                    if let Some(new_hash) = block.hash {
                                         // don't send repeat blocks
-                                    let new_hash =
-                                        block.hash.expect("blocks here should always have hashes");
-
                                         if new_hash != last_hash {
                                             // new hash!
                                             last_hash = new_hash;
@@ -1010,6 +1008,17 @@ impl Web3Rpc {
                                             )
                                             .await?;
                                         }
+                                    } else {
+                                        // TODO: why is this happening?
+                                        warn!("empty head block on {}", self);
+
+                                        self.send_head_block_result(
+                                            Ok(None),
+                                            &block_sender,
+                                            block_map.clone(),
+                                        )
+                                        .await?;
+                                    }
                                 }
                                 Err(err) => {
                                     // we did not get a block back. something is up with the server. take it out of rotation