Fix error if layer number ends up out of range

It normally doesn't go out of range, but some defensive coding just in case it does. And to fix a typing error of course.

1 files changed, 2 insertions, 0 deletions

diff --git a/plugins/GCodeReader/FlavorParser.py b/plugins/GCodeReader/FlavorParser.py
index baf21d47ce..f8618712a1 100644
--- a/plugins/GCodeReader/FlavorParser.py
+++ b/plugins/GCodeReader/FlavorParser.py
@@ -107,6 +107,8 @@ class FlavorParser:
             self._layer_data_builder.setLayerHeight(self._layer_number, path[0][2])
             self._layer_data_builder.setLayerThickness(self._layer_number, layer_thickness)
             this_layer = self._layer_data_builder.getLayer(self._layer_number)
+            if not this_layer:
+                return False
         except ValueError:
             return False
         count = len(path)