diff --git a/src/widgets/atcoreinstancewidget.cpp b/src/widgets/atcoreinstancewidget.cpp
--- a/src/widgets/atcoreinstancewidget.cpp
+++ b/src/widgets/atcoreinstancewidget.cpp
@@ -597,13 +597,15 @@
             return;
         }
         m_plotWidget->addPlot(i18n("Actual Bed"));
-        connect(&m_core.temperature(), &Temperature::bedTemperatureChanged, [this](const float & temp) {
+        connect(&m_core.temperature(), &Temperature::bedTemperatureChanged, [this] {
+            const float temp = m_core.temperature().bedTemperature();
             checkTemperature(0x00, 0, temp);
             m_plotWidget->appendPoint(i18n("Actual Bed"), temp);
             m_bedExtWidget->updateBedTemp(temp);
         });
         m_plotWidget->addPlot(i18n("Target Bed"));
-        connect(&m_core.temperature(), &Temperature::bedTargetTemperatureChanged, [this](const float & temp) {
+        connect(&m_core.temperature(), &Temperature::bedTargetTemperatureChanged, [this] {
+            const float temp = m_core.temperature().bedTargetTemperature();
             checkTemperature(0x01, 0, temp);
             m_plotWidget->appendPoint(i18n("Target Bed"), temp);
             m_bedExtWidget->updateBedTargetTemp(int(temp));
@@ -626,13 +628,15 @@
         }
         //Add Extruder.
         m_plotWidget->addPlot(i18n("Actual Ext.1"));
-        connect(&m_core.temperature(), &Temperature::extruderTemperatureChanged, this, [this](const float & temp) {
+        connect(&m_core.temperature(), &Temperature::extruderTemperatureChanged, this, [this] {
+            const float temp = m_core.temperature().extruderTemperature();
             checkTemperature(0x02, 0, temp);
             m_plotWidget->appendPoint(i18n("Actual Ext.1"), temp);
             m_bedExtWidget->updateExtTemp(temp);
         });
         m_plotWidget->addPlot(i18n("Target Ext.1"));
-        connect(&m_core.temperature(), &Temperature::extruderTargetTemperatureChanged, this, [this](const float & temp) {
+        connect(&m_core.temperature(), &Temperature::extruderTargetTemperatureChanged, this, [this] {
+            const float temp = m_core.temperature().extruderTargetTemperature();
             checkTemperature(0x03, 0, temp);
             m_plotWidget->appendPoint(i18n("Target Ext.1"), temp);
             m_bedExtWidget->updateExtTargetTemp(int(temp));