diff --git a/cmd/exec/exec.go b/cmd/exec/exec.go
index 5c794998..375a8317 100644
--- a/cmd/exec/exec.go
+++ b/cmd/exec/exec.go
@@ -34,8 +34,13 @@ func Init() {
 			return false
 		}
 
-		waiter <- conn
-		return true
+		// unblocking write to channel
+		select {
+		case waiter <- conn:
+			return true
+		default:
+			return false
+		}
 	})
 
 	streams.HandleFunc("exec", Handle)