diff --git a/web/cashtab/src/hooks/useWebAuthentication.js b/web/cashtab/src/hooks/useWebAuthentication.js
--- a/web/cashtab/src/hooks/useWebAuthentication.js
+++ b/web/cashtab/src/hooks/useWebAuthentication.js
@@ -53,42 +53,45 @@
 
     // Run Once
     useEffect(async () => {
-        // check to see if user device supports User Verification
-        const available =
-            await window.PublicKeyCredential.isUserVerifyingPlatformAuthenticatorAvailable();
-        // only attempt to save/load authentication configuration from local storage if web authetication is supported
-        if (available) {
-            const authenticationConfig =
-                await loadAuthenticationConfigFromLocalStorage();
-            // if this is the first time the app is run, then save the default config value
-            if (authenticationConfig === null) {
-                saveAuthenticationConfigToLocalStorage();
-            } else {
-                setUserId(authenticationConfig.userId);
-                setCredentialId(authenticationConfig.credentialId);
-                setIsAuthenticationRequired(
-                    authenticationConfig.isAuthenticationRequired,
-                );
-            }
-            // signout the user when the app is not visible (minimize the browser, switch tab, switch app window)
-            const handleDocVisibilityChange = () => {
-                if (document.visibilityState !== 'visible')
-                    setIsSignedIn(false);
-            };
-            document.addEventListener(
-                'visibilitychange',
-                handleDocVisibilityChange,
-            );
+        if (window && window.PublicKeyCredential) {
+            // check to see if user device supports User Verification
+            const available =
+                await window.PublicKeyCredential.isUserVerifyingPlatformAuthenticatorAvailable();
 
-            setIsWebAuthnSupported(available);
-            setLoading(false);
-
-            return () => {
-                document.removeEventListener(
+            // only attempt to save/load authentication configuration from local storage if web authetication is supported
+            if (available) {
+                const authenticationConfig =
+                    await loadAuthenticationConfigFromLocalStorage();
+                // if this is the first time the app is run, then save the default config value
+                if (authenticationConfig === null) {
+                    saveAuthenticationConfigToLocalStorage();
+                } else {
+                    setUserId(authenticationConfig.userId);
+                    setCredentialId(authenticationConfig.credentialId);
+                    setIsAuthenticationRequired(
+                        authenticationConfig.isAuthenticationRequired,
+                    );
+                }
+                // signout the user when the app is not visible (minimize the browser, switch tab, switch app window)
+                const handleDocVisibilityChange = () => {
+                    if (document.visibilityState !== 'visible')
+                        setIsSignedIn(false);
+                };
+                document.addEventListener(
                     'visibilitychange',
                     handleDocVisibilityChange,
                 );
-            };
+
+                setIsWebAuthnSupported(available);
+                setLoading(false);
+
+                return () => {
+                    document.removeEventListener(
+                        'visibilitychange',
+                        handleDocVisibilityChange,
+                    );
+                };
+            }
         }
     }, []);