diff --git a/qt/DeviceView.cpp b/qt/DeviceView.cpp
index 050e9775..7fda75e6 100644
--- a/qt/DeviceView.cpp
+++ b/qt/DeviceView.cpp
@@ -390,6 +390,14 @@ void DeviceView::paintEvent(QPaintEvent* /* event */)
     QPainter painter(this);
     QFont font = painter.font();
 
+    /*-----------------------------------------------------*\
+    | If controller has resized, reinitialize local data    |
+    \*-----------------------------------------------------*/
+    if(controller->leds.size() != led_pos.size())
+    {
+        setController(controller);
+    }
+
     /*-----------------------------------------------------*\
     | LED rectangles                                        |
     \*-----------------------------------------------------*/