diff --git a/src/helpers/Monitor.cpp b/src/helpers/Monitor.cpp
index 83d0db0f..196492c1 100644
--- a/src/helpers/Monitor.cpp
+++ b/src/helpers/Monitor.cpp
@@ -302,7 +302,8 @@ void CMonitor::onDisconnect(bool destroy) {
         g_pCompositor->m_pLastMonitor = nullptr;
     }
 
-    activeWorkspace->m_bVisible = false;
+    if (activeWorkspace)
+        activeWorkspace->m_bVisible = false;
     activeWorkspace.reset();
 
     if (!destroy)