Mintplex-Labs/anything-llm · error

No model router found for this workspace.

Error message

No model router found for this workspace.

What it means

AnythingLLMModelRouter.resolve() must load a model-router configuration before it can route; it calls ModelRouterService.resolveRouterForWorkspace(), which returns null when the workspace has no router_id or the referenced router record cannot be loaded (e.g. deleted). resolve() then throws this error, so no delegate LLM provider is ever created.

Solutions

1. Open workspace settings and (re)select a model router so router_id is set on the workspace, then retry
2. If the router was deleted, create a new model router and assign it to the workspace
3. Verify the workspace record actually has a non-null router_id — null always produces this error
4. Restart the server (or let the router cache invalidate) after router configuration changes

Example fix

// before
const router = new AnythingLLMModelRouter(workspace);
await router.resolve(ctx); // throws when workspace.router_id is null
// after
if (!workspace.router_id)
  throw new Error('Attach a model router to this workspace first');
await router.resolve(ctx);

const svc = ModelRouterService.getInstance();
const router = await svc.resolveRouterForWorkspace(workspace);
if (!router)
  throw new Error('Workspace has no model router attached — assign one in workspace settings');

function hasRouterAttached(workspace) {
  return typeof workspace?.router_id === 'number' && workspace.router_id > 0;
}

try {
  await modelRouter.resolve(context, { user, thread });
} catch (e) {
  if (e.message === 'No model router found for this workspace.') {
    // fall back to the workspace default LLM, or prompt the user to attach a router
  }
  throw e;
}

When it happens

Trigger: Workspace chat uses the model router but workspace.router_id is null (router never assigned or detached); the referenced router row was deleted while workspaces still point at it; a stale in-process workspace object is used after the router was removed; calling resolve() on a workspace whose router assignment is still mid-save.

Common situations: Admin deletes a model router that workspaces still reference; DB restore/migration drops model_routers rows; race between router reassignment and an incoming chat request.

Related errors

• Bad Request
• Internal Server Error
• KoboldCPP must have a valid base path to use for the api.
• KoboldCPP must have a valid model set.
• LiteLLM must have a valid base path to use for the api.

AI-assisted analysis of Mintplex-Labs/anything-llm@3aec848f28 (2026-08-18). Data as JSON: /api/errors/2a9cdc6b23a9c143. Report an issue: GitHub.

Appendix: source

Thrown at server/utils/AiProviders/modelRouter/index.js:38

  /**
   * Resolve the route and instantiate the delegate LLM provider.
   * Must be called before any chat methods.
   *
   * Flow:
   * 1. Evaluate calculated rules (always — they're free)
   * 2. Evaluate LLM rules (uses cache to avoid expensive calls)
   * 3. If nothing matched, use the sticky route (previous model stays)
   * 4. If sticky expired, fall back to the default model
   *
   * @param {Object} context - { prompt, conversationHistory, conversationTokenCount }
   * @param {Object} opts - { user, thread }
   */
  async resolve(context = {}, { user = null, thread = null } = {}) {
    this.router = await this.routerService.resolveRouterForWorkspace(
      this.workspace
    );
    if (!this.router)
      throw new Error("No model router found for this workspace.");

    const rules = this.router.rules || [];
    const stickyMs = (this.router.cooldown_seconds ?? 300) * 1000;
    this._routeKey = this.routerService.routeCacheKey(
      user?.id,
      this.workspace.slug,
      thread?.slug
    );

    this.routerService.logRoutingContext(this.router, rules, context);

    // Step 1: Calculated rules (always re-evaluated, they're instant)
    const calcResult = this.routerService.evaluateCalculatedRules(
      rules,
      context
    );
    if (calcResult) {
      this.resolvedRoute = calcResult;

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