diff --git a/.changeset/fix-oauth-prefetch-race.md b/.changeset/fix-oauth-prefetch-race.md
new file mode 100644
index 000000000..9cf755b02
--- /dev/null
+++ b/.changeset/fix-oauth-prefetch-race.md
@@ -0,0 +1,10 @@
+---
+"@crossmint/client-sdk-react-ui": patch
+---
+
+Fix OAuth URL prefetch race condition when auth dialog opens before initialization completes.
+
+- Gate prefetch on `jwt == null` instead of `getAuthStatus() === "logged-out"` so the prefetch still runs when the dialog is open during initialization.
+- Skip prefetch when `crossmintAuth` is not yet available to avoid fetching with a null client.
+- Initialize `isLoadingOauthUrlMap` to `false` so consumers are not stuck in a loading state when the prefetch has not started.
+- Strengthen URL validation to reject empty strings in addition to null/undefined.
diff --git a/packages/client/ui/react-ui/src/hooks/useOAuthWindowListener.ts b/packages/client/ui/react-ui/src/hooks/useOAuthWindowListener.ts
index 0fc7a6891..a879ca0d9 100644
--- a/packages/client/ui/react-ui/src/hooks/useOAuthWindowListener.ts
+++ b/packages/client/ui/react-ui/src/hooks/useOAuthWindowListener.ts
@@ -48,7 +48,7 @@ export const useOAuthWindowListener = (oauthUrlMap: OAuthUrlMap, setError: (erro
 
                 const prefetchedUrl = oauthUrlMap[provider];
                 const resolvedUrl = prefetchedUrl || (await crossmintAuth?.getOAuthUrl(provider));
-                if (resolvedUrl == null) {
+                if (!resolvedUrl) {
                     throw new Error("Failed to resolve OAuth URL");
                 }
                 baseUrl = new URL(resolvedUrl);
diff --git a/packages/client/ui/react-ui/src/providers/CrossmintAuthProvider.tsx b/packages/client/ui/react-ui/src/providers/CrossmintAuthProvider.tsx
index 3a049c96e..62881b279 100644
--- a/packages/client/ui/react-ui/src/providers/CrossmintAuthProvider.tsx
+++ b/packages/client/ui/react-ui/src/providers/CrossmintAuthProvider.tsx
@@ -128,7 +128,7 @@ function CrossmintAuthProviderContent({
                     defaultEmail,
                 }}
             >
-                <OAuthFlowProvider prefetchOAuthUrls={getAuthStatus() === "logged-out" && prefetchOAuthUrls}>
+                <OAuthFlowProvider prefetchOAuthUrls={baseAuth.jwt == null && prefetchOAuthUrls}>
                     <AuthWrapper loginWithOAuthRef={loginWithOAuthRef}>
                         {children}
                         <AuthFormDialog open={dialogOpen} />
diff --git a/packages/client/ui/react-ui/src/providers/auth/OAuthFlowProvider.tsx b/packages/client/ui/react-ui/src/providers/auth/OAuthFlowProvider.tsx
index d13260ddf..ecc39e464 100644
--- a/packages/client/ui/react-ui/src/providers/auth/OAuthFlowProvider.tsx
+++ b/packages/client/ui/react-ui/src/providers/auth/OAuthFlowProvider.tsx
@@ -38,7 +38,7 @@ export function OAuthFlowProvider({
     const { setError } = useAuthForm();
 
     const [oauthUrlMap, setOauthUrlMap] = useState<OAuthUrlMap>(initialOAuthUrlMap);
-    const [isLoadingOauthUrlMap, setIsLoadingOauthUrlMap] = useState(true);
+    const [isLoadingOauthUrlMap, setIsLoadingOauthUrlMap] = useState(false);
 
     const {
         createPopupAndSetupListeners,
@@ -47,6 +47,9 @@ export function OAuthFlowProvider({
     } = useOAuthWindowListener(oauthUrlMap, setError);
 
     const preFetchAndSetOauthUrl = useCallback(async () => {
+        if (crossmintAuth == null) {
+            return;
+        }
         setIsLoadingOauthUrlMap(true);
         try {
             const oauthProviders = (loginMethods || []).filter(