diff --git a/src/core.cpp b/src/core.cpp
index 2c9f9e0c9..e4fdd7529 100644
--- a/src/core.cpp
+++ b/src/core.cpp
@@ -1276,7 +1276,8 @@ void Core::switchConfiguration(const QString& profile)
     HistoryKeeper::resetInstance();
 
     start();
-    Widget::getInstance()->setEnabledThreadsafe(true);
+    if (isReady())
+        Widget::getInstance()->setEnabledThreadsafe(true);
 }
 
 void Core::loadFriends()