txwatcher: Add nil check before calling the blockchain rpc

We encountered an error with a missing blockchain client in #74. This was not reproducible by now so we hope this log will help solving this issue in the future.
ElementsProject · Jul 17, 2022 · 6135d8d · 6135d8d
1 parent 26b3785
commit 6135d8d
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/txwatcher/rpctxwatcher.go b/txwatcher/rpctxwatcher.go
@@ -52,6 +52,10 @@ type BlockchainRpcTxWatcher struct {
 }
 
 func (s *BlockchainRpcTxWatcher) GetBlockHeight() (uint32, error) {
+	if s.blockchain == nil {
+		return 0, fmt.Errorf("missing blockchain rpc client")
+	}
+
 	blockheight, err := s.blockchain.GetBlockHeight()
 	if err != nil {
 		return 0, err