diff --git a/src/slic3r/GUI/DeviceManager.cpp b/src/slic3r/GUI/DeviceManager.cpp
index 730b8ca7a..871eb64af 100644
--- a/src/slic3r/GUI/DeviceManager.cpp
+++ b/src/slic3r/GUI/DeviceManager.cpp
@@ -2924,6 +2924,7 @@ void MachineObject::reset()
     BOOST_LOG_TRIVIAL(trace) << "reset dev_id=" << dev_id;
     last_update_time = std::chrono::system_clock::now();
     m_push_count = 0;
+    m_full_msg_count = 0;
     is_220V_voltage = false;
     get_version_retry = 0;
     camera_recording = false;
@@ -3028,7 +3029,7 @@ bool MachineObject::is_info_ready(bool check_version) const
 
     std::chrono::system_clock::time_point curr_time = std::chrono::system_clock::now();
     auto diff = std::chrono::duration_cast<std::chrono::microseconds>(last_push_time - curr_time);
-    if (m_push_count > 0 && diff.count() < PUSHINFO_TIMEOUT) {
+    if (m_full_msg_count > 0 && m_push_count > 0 && diff.count() < PUSHINFO_TIMEOUT) {
         return true;
     }
     return false;
@@ -3152,6 +3153,7 @@ int MachineObject::parse_json(std::string payload, bool key_field_only)
                         if (j_pre["print"]["msg"].get<int>() == 0) {           //all message
                             BOOST_LOG_TRIVIAL(trace) << "static: get push_all msg, dev_id=" << dev_id;
                             m_push_count++;
+                            m_full_msg_count++;
                             if (!printer_type.empty())
                                 print_json.load_compatible_settings(printer_type, "");
                             print_json.diff2all_base_reset(j_pre);
diff --git a/src/slic3r/GUI/DeviceManager.hpp b/src/slic3r/GUI/DeviceManager.hpp
index 33a7a58db..d6ac5fba9 100644
--- a/src/slic3r/GUI/DeviceManager.hpp
+++ b/src/slic3r/GUI/DeviceManager.hpp
@@ -891,6 +891,7 @@ public:
     std::vector<int> stage_list_info;
     int stage_curr = 0;
     int m_push_count = 0;
+    int m_full_msg_count = 0; /*the full message count, there are full or diff messages from network*/
     bool calibration_done { false };
 
     bool is_axis_at_home(std::string axis);
diff --git a/src/slic3r/GUI/Widgets/AMSControl.cpp b/src/slic3r/GUI/Widgets/AMSControl.cpp
index 10d965f9f..58d48faa6 100644
--- a/src/slic3r/GUI/Widgets/AMSControl.cpp
+++ b/src/slic3r/GUI/Widgets/AMSControl.cpp
@@ -3030,6 +3030,7 @@ void AMSControl::CreateAmsDoubleNozzle()
     }
     if (m_ext_info.size() <= 1) {
         BOOST_LOG_TRIVIAL(trace) << "vt_slot empty!";
+        assert(0);
         return;
     }
     AMSinfo ext_info;