diff --git a/src/protocol.c b/src/protocol.c
index 07fe022..8e1e4b7 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -218,6 +218,8 @@ thread_run_command(void *args) {
                         break;
                     }
                 }
+
+                if (client->pty_len <= 0) break;
             }
             break;
     }