diff --git a/packages/epo-react-lib/package.json b/packages/epo-react-lib/package.json
index 9d2fb892..07350ea4 100644
--- a/packages/epo-react-lib/package.json
+++ b/packages/epo-react-lib/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@rubin-epo/epo-react-lib",
   "description": "Rubin Observatory Education & Public Outreach team React UI library.",
-  "version": "2.0.4",
+  "version": "2.0.5",
   "author": "Rubin EPO",
   "license": "MIT",
   "homepage": "https://lsst-epo.github.io/epo-react-lib",
diff --git a/packages/epo-react-lib/src/lib/utils.ts b/packages/epo-react-lib/src/lib/utils.ts
index 2cf30dae..eb42814f 100644
--- a/packages/epo-react-lib/src/lib/utils.ts
+++ b/packages/epo-react-lib/src/lib/utils.ts
@@ -73,11 +73,11 @@ export function isStyleSupported(prop: string, value: string): boolean {
   // If no value is supplied, use "inherit"
   value = arguments.length === 2 ? value : "inherit";
   // Try the native standard method first
-  if ("CSS" in window && "supports" in window.CSS) {
+  if (window && "CSS" in window && "supports" in window.CSS) {
     return window.CSS.supports(prop, value);
   }
   // Check Opera's native method
-  if ("supportsCSS" in window) {
+  if (window && "supportsCSS" in window) {
     return (window.supportsCSS as (property: string, value: string) => boolean)(
       prop,
       value