diff --git a/op-enclave/cmd/server/main.go b/op-enclave/cmd/server/main.go
index 08ec932f..24118d8b 100644
--- a/op-enclave/cmd/server/main.go
+++ b/op-enclave/cmd/server/main.go
@@ -36,8 +36,8 @@ func main() {
 		}
 		_ = r.Body.Close()
 
-		conn := pool.Get().(*vsock.Conn)
-		if conn == nil {
+		conn, ok := pool.Get().(*vsock.Conn)
+		if !ok || conn == nil {
 			w.WriteHeader(http.StatusInternalServerError)
 			return
 		}