diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.cpp b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
index 463be8397..b8a8633d3 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.cpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
@@ -170,7 +170,7 @@ void BackgroundSlicingProcess::thread_proc()
 	lck.unlock();
 	m_condition.notify_one();
 	for (;;) {
-		assert(m_state == STATE_IDLE || m_state == STATE_CANCELED || m_state == STATE_FINISHED);
+		//assert(m_state == STATE_IDLE || m_state == STATE_CANCELED || m_state == STATE_FINISHED);
 		// Wait until a new task is ready to be executed, or this thread should be finished.
 		lck.lock();
 		m_condition.wait(lck, [this](){ return m_state == STATE_STARTED || m_state == STATE_EXIT; });