diff --git a/src/warnet/cln.py b/src/warnet/cln.py
index d0bf907ef..53ed5ffa1 100644
--- a/src/warnet/cln.py
+++ b/src/warnet/cln.py
@@ -82,6 +82,8 @@ def open_channel_to_tank(self, index: int, channel_open_data: str) -> str:
         tank = self.warnet.tanks[index]
         [pubkey, host] = tank.lnnode.getURI().split("@")
         res = self.lncli(f"fundchannel id={pubkey} {channel_open_data}")
+        if "txid" not in res or "outnum" not in res:
+            raise ValueError(f"Error opening channel to tank: {res}")
         return f"{res['txid']}:{res['outnum']}"
 
     def update_channel_policy(self, chan_point: str, policy: str) -> str: