diff --git a/src/slic3r/GUI/DeviceManager.cpp b/src/slic3r/GUI/DeviceManager.cpp
index ddb0a9fcb..c591767c9 100644
--- a/src/slic3r/GUI/DeviceManager.cpp
+++ b/src/slic3r/GUI/DeviceManager.cpp
@@ -2032,6 +2032,7 @@ int MachineObject::parse_json(std::string payload)
                                     });
                                     return -1;
                                 }
+                                return -1;
                             }
                         } else {
                             BOOST_LOG_TRIVIAL(warning) << "unsupported msg_type=" << j_pre["print"]["msg"].get<std::string>();