diff --git a/plugins/CuraEngineBackend/StartSliceJob.py b/plugins/CuraEngineBackend/StartSliceJob.py
index 0851261877..dee6f2b64c 100644
--- a/plugins/CuraEngineBackend/StartSliceJob.py
+++ b/plugins/CuraEngineBackend/StartSliceJob.py
@@ -51,6 +51,20 @@ class StartSliceJob(Job):
     def getSliceMessage(self):
         return self._slice_message
 
+    ##  Check if a stack has any errors.
+    ##  returns true if it has errors, false otherwise.
+    def _checkStackForErrors(self, stack):
+        if stack is None:
+            return False
+
+        for key in stack.getAllKeys():
+            validation_state = stack.getProperty(key, "validationState")
+            if validation_state in (ValidatorState.Exception, ValidatorState.MaximumError, ValidatorState.MinimumError):
+                Logger.log("w", "Setting %s is not valid, but %s. Aborting slicing.", key, validation_state)
+                return True
+            Job.yieldThread()
+        return False
+
     ##  Runs the job that initiates the slicing.
     def run(self):
         stack = Application.getInstance().getGlobalContainerStack()
@@ -59,30 +73,18 @@ class StartSliceJob(Job):
             return
 
         # Don't slice if there is a setting with an error value.
-        for key in stack.getAllKeys():
-            validation_state = stack.getProperty(key, "validationState")
-            if validation_state in (ValidatorState.Exception, ValidatorState.MaximumError, ValidatorState.MinimumError):
-                Logger.log("w", "Setting %s is not valid, but %s. Aborting slicing.", key, validation_state)
-                self.setResult(StartJobResult.SettingError)
-                return
-
-            Job.yieldThread()
+        if self._checkStackForErrors(stack):
+            self.setResult(StartJobResult.SettingError)
+            return
 
         # Don't slice if there is a per object setting with an error value.
         for node in DepthFirstIterator(self._scene.getRoot()):
             if type(node) is not SceneNode or not node.isSelectable():
                 continue
 
-            node_stack = node.callDecoration("getStack")
-            if node_stack:
-                for key in node_stack.getAllKeys():
-                    validation_state = node_stack.getProperty(key, "validationState")
-                    if validation_state in (ValidatorState.Exception, ValidatorState.MaximumError, ValidatorState.MinimumError):
-                        Logger.log("w", "Per object setting %s is not valid, but %s. Aborting slicing.", key, validation_state)
-                        self.setResult(StartJobResult.SettingError)
-                        return
-
-                    Job.yieldThread()
+            if self._checkStackForErrors(node.callDecoration("getStack")):
+                self.setResult(StartJobResult.SettingError)
+                return
 
         with self._scene.getSceneLock():
             # Remove old layer data.