Important

Fix 500 errors in dev by returning null when Stripe client is uninitialized in BillingUsageChart.tsx and cloudBillingRouter.ts.

• Behavior:
  • In BillingUsageChart.tsx, return null if usage.data is null to avoid errors when STRIPE_SECRET_KEY is not set in dev mode.
  • In cloudBillingRouter.ts, log a warning and return null in getUsage if STRIPE_SECRET_KEY is not set and NEXT_PUBLIC_LANGFUSE_CLOUD_REGION is "DEV".
• Logging:
  • Add warning log in cloudBillingRouter.ts when STRIPE_SECRET_KEY is not set in dev environment.

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