diff --git a/dist/ReactGraph.js b/dist/ReactGraph.js
index 6b65d34f..d0a5af05 100644
--- a/dist/ReactGraph.js
+++ b/dist/ReactGraph.js
@@ -34185,6 +34185,8 @@
     return e.target.className && e.target.className.includes && (e.target.className.includes('source') || e.target.className.includes('target'));
   };
 
+  var hasResizeObserver = !!window.ResizeObserver;
+
   var getHandleBounds = function getHandleBounds(sel, nodeElement, parentBounds, k) {
     var handles = nodeElement.querySelectorAll(sel);
 
@@ -34346,9 +34348,10 @@
 
       React.useEffect(function () {
         updateNode();
+        var resizeObserver = null;
 
-        if (ResizeObserver) {
-          var _resizeObserver = new ResizeObserver(function (entries) {
+        if (hasResizeObserver) {
+          resizeObserver = new ResizeObserver(function (entries) {
             var _iteratorNormalCompletion = true;
             var _didIteratorError = false;
             var _iteratorError = undefined;
@@ -34373,12 +34376,13 @@
               }
             }
           });
-
-          _resizeObserver.observe(nodeElement.current);
+          resizeObserver.observe(nodeElement.current);
         }
 
         return function () {
-          resizeObserver.unobserve(nodeElement.current);
+          if (hasResizeObserver && resizeObserver) {
+            resizeObserver.unobserve(nodeElement.current);
+          }
         };
       }, []);
       return React__default.createElement(reactDraggable.DraggableCore, {
diff --git a/src/NodeRenderer/NodeTypes/wrapNode.js b/src/NodeRenderer/NodeTypes/wrapNode.js
index 0b077f7b..f894bcbd 100644
--- a/src/NodeRenderer/NodeTypes/wrapNode.js
+++ b/src/NodeRenderer/NodeTypes/wrapNode.js
@@ -12,6 +12,8 @@ const isHandle = e => (
   (e.target.className.includes('source') || e.target.className.includes('target'))
 );
 
+const hasResizeObserver = !!window.ResizeObserver;
+
 const getHandleBounds = (sel, nodeElement, parentBounds, k) => {
   const handles = nodeElement.querySelectorAll(sel);
 
@@ -112,8 +114,10 @@ export default NodeComponent => {
     useEffect(() => {
       updateNode();
 
-      if (ResizeObserver) {
-        const resizeObserver = new ResizeObserver(entries => {
+      let resizeObserver = null;
+
+      if (hasResizeObserver) {
+        resizeObserver = new ResizeObserver(entries => {
           for (let entry of entries) {
             updateNode();
           }
@@ -123,7 +127,9 @@ export default NodeComponent => {
       }
 
       return () => {
-        resizeObserver.unobserve(nodeElement.current);
+        if (hasResizeObserver && resizeObserver) {
+          resizeObserver.unobserve(nodeElement.current);
+        }
       }
     }, []);