diff --git a/cura/PrintInformation.py b/cura/PrintInformation.py
index 15cae19ec9..0369f536fa 100644
--- a/cura/PrintInformation.py
+++ b/cura/PrintInformation.py
@@ -75,6 +75,8 @@ class PrintInformation(QObject):
         Application.getInstance().getMachineManager().activeMaterialChanged.connect(self._onActiveMaterialChanged)
         self._onActiveMaterialChanged()
 
+        self._material_amounts = []
+
     currentPrintTimeChanged = pyqtSignal()
 
     preSlicedChanged = pyqtSignal()