diff --git a/cura/Arranging/Arrange.py b/cura/Arranging/Arrange.py
index a70ccb9f0c..35f155f4cf 100644
--- a/cura/Arranging/Arrange.py
+++ b/cura/Arranging/Arrange.py
@@ -196,6 +196,7 @@ class Arrange:
                 start_idx = 0
         else:
             start_idx = 0
+        priority = 0
         for priority in self._priority_unique_values[start_idx::step]:
             tryout_idx = numpy.where(self._priority == priority)
             for idx in range(len(tryout_idx[0])):