diff --git a/src/common/draggable-window/DraggableWindow.tsx b/src/common/draggable-window/DraggableWindow.tsx
index e3b8695..20a17e9 100644
--- a/src/common/draggable-window/DraggableWindow.tsx
+++ b/src/common/draggable-window/DraggableWindow.tsx
@@ -30,7 +30,7 @@ export const DraggableWindow: FC<DraggableWindowProps> = props =>
     const [isDragging, setIsDragging] = useState(false);
     const [isPositioned, setIsPositioned] = useState(false);
     const [dragHandler, setDragHandler] = useState<HTMLElement>(null);
-    const elementRef = useRef<HTMLDivElement>();
+    const elementRef = useRef<HTMLDivElement>(null);
     const bringToTop = useCallback(() => {
         let zIndex = 400;
         for (const existingWindow of CURRENT_WINDOWS)