diff --git a/src/Container.tsx b/src/Container.tsx
index bb78d98..54af251 100644
--- a/src/Container.tsx
+++ b/src/Container.tsx
@@ -68,8 +68,10 @@ class Container extends Component<ContainerProps> {
   }
 
   componentWillUnmount() {
-    this.container.dispose();
-    this.container = null!;
+    if (this.container) {
+      this.container.dispose();
+      this.container = null!;
+    }
   }
 
   componentDidUpdate(prevProps: ContainerProps) {