diff --git a/packages/wagmi-generator/resolveProxyContracts.ts b/packages/wagmi-generator/resolveProxyContracts.ts
index 4b14d20f..859424e9 100644
--- a/packages/wagmi-generator/resolveProxyContracts.ts
+++ b/packages/wagmi-generator/resolveProxyContracts.ts
@@ -23,7 +23,9 @@ function getAddress(
   if (typeof address == "string") {
     return address as Address;
   } else {
-    return address[chainId];
+    const resolved = address[chainId];
+    if (!resolved) throw new Error(`Address not found for chainId ${chainId}`);
+    return resolved;
   }
 }