diff --git a/plugins/CuraEngineBackend/CuraEngineBackend.py b/plugins/CuraEngineBackend/CuraEngineBackend.py
index 3272fb019d..f64dd08f3e 100755
--- a/plugins/CuraEngineBackend/CuraEngineBackend.py
+++ b/plugins/CuraEngineBackend/CuraEngineBackend.py
@@ -290,6 +290,7 @@ class CuraEngineBackend(QObject, Backend):
             self._start_slice_job = None
 
         if job.isCancelled() or job.getError() or job.getResult() == StartSliceJob.StartJobResult.Error:
+            self.backendStateChange.emit(BackendState.Error)
             return
 
         if job.getResult() == StartSliceJob.StartJobResult.MaterialIncompatible: