diff --git a/src/PortalWrapper.js b/src/PortalWrapper.js
index b9cf8811..bd3e8d98 100644
--- a/src/PortalWrapper.js
+++ b/src/PortalWrapper.js
@@ -73,7 +73,7 @@ class PortalWrapper extends React.Component {
         return document.querySelectorAll(getContainer)[0];
       }
       if (typeof getContainer === 'function') {
-        return getContainer();
+        return getContainer() || document.body;
       }
       if (
         typeof getContainer === 'object' &&