add check incase provider doesnt exist in models list

packages/opencode/src/provider/provider.ts

@@ -870,7 +870,12 @@ export namespace Provider {
 
     for (const [providerID, fn] of Object.entries(CUSTOM_LOADERS)) {
       if (disabled.has(providerID)) continue
-      const result = await fn(database[providerID])
+      const data = database[providerID]
+      if (!data) {
+        log.error("Provider does not exist in model list " + providerID)
+        continue
+      }
+      const result = await fn(data)
       if (result && (result.autoload || providers[providerID])) {
         if (result.getModel) modelLoaders[providerID] = result.getModel
         mergeProvider(providerID, {