diff --git a/cura/ConvexHullJob.py b/cura/ConvexHullJob.py
index 8d33efef39..9dfc4c0065 100644
--- a/cura/ConvexHullJob.py
+++ b/cura/ConvexHullJob.py
@@ -42,7 +42,7 @@ class ConvexHullJob(Job):
             # Don't use data below 0.
             # TODO; We need a better check for this as this gives poor results for meshes with long edges.
             vertex_data = vertex_data[vertex_data[:,1] >= 0]
-            hull = Polygon(numpy.rint(vertex_data[:, [0, 2]]).astype(int))
+            hull = Polygon(vertex_data[:, [0, 2]])
 
         # First, calculate the normal convex hull around the points
         hull = hull.getConvexHull()
diff --git a/plugins/CuraEngineBackend/CuraEngineBackend.py b/plugins/CuraEngineBackend/CuraEngineBackend.py
index 639a8eda40..5677515a9e 100644
--- a/plugins/CuraEngineBackend/CuraEngineBackend.py
+++ b/plugins/CuraEngineBackend/CuraEngineBackend.py
@@ -90,10 +90,13 @@ class CuraEngineBackend(Backend):
     #   \return list of commands and args / parameters.
     def getEngineCommand(self):
         active_machine = Application.getInstance().getMachineManager().getActiveMachineInstance()
+        json_path = ""
         if not active_machine:
-            return None
+            json_path = Resources.getPath(Resources.MachineDefinitions, "fdmprinter.json")
+        else:
+            json_path = active_machine.getMachineDefinition().getPath()
 
-        return [Preferences.getInstance().getValue("backend/location"), "connect", "127.0.0.1:{0}".format(self._port), "-j", active_machine.getMachineDefinition().getPath(), "-vv"]
+        return [Preferences.getInstance().getValue("backend/location"), "connect", "127.0.0.1:{0}".format(self._port), "-j", json_path, "-vv"]
 
     ##  Emitted when we get a message containing print duration and material amount. This also implies the slicing has finished.
     #   \param time The amount of time the print will take.