diff --git a/src/slic3r/GUI/DeviceManager.cpp b/src/slic3r/GUI/DeviceManager.cpp
index 0bce161db..5cebbf0d8 100644
--- a/src/slic3r/GUI/DeviceManager.cpp
+++ b/src/slic3r/GUI/DeviceManager.cpp
@@ -3560,6 +3560,9 @@ int MachineObject::parse_json(std::string payload, bool key_field_only)
                                     }
                                 }
                             }
+                            else {
+                                nozzle_type = "";
+                            }
                         }
                         catch (...) {
                             ;