diff --git a/js/adslot.js b/js/adslot.js
index c1b903c..6fa1d4f 100644
--- a/js/adslot.js
+++ b/js/adslot.js
@@ -49,7 +49,9 @@ export class AdSlot extends React.Component {
       slotId: this.props.slotId || null,
       className: this.props.className || '',
     };
-    this.adElementRef = React.createRef ? React.createRef() : null;
+    this.adElementRef = React.createRef ? React.createRef() : (element) => {
+      this.adElementRef = element;
+    };
   }
 
   componentDidMount() {
diff --git a/lib/adslot.js b/lib/adslot.js
index 1609229..5468f17 100644
--- a/lib/adslot.js
+++ b/lib/adslot.js
@@ -66,7 +66,9 @@ function (_React$Component) {
       slotId: _this.props.slotId || null,
       className: _this.props.className || ''
     };
-    _this.adElementRef = _react.default.createRef ? _react.default.createRef() : null;
+    _this.adElementRef = _react.default.createRef ? _react.default.createRef() : function (element) {
+      _this.adElementRef = element;
+    };
     return _this;
   }