langfuse/langfuse · error · Error

Failed to create prompt

Error message

Failed to create prompt

What it means

Thrown when a Prisma create() for a new prompt returns a falsy result in the promptCreate mutation. Prisma create() practically never returns null, so hitting this means the create call was skipped, returned early, or an unexpected runtime shape occurred. It is a defensive guard, not an expected business error.

Source

Thrown at web/src/features/prompts/server/routers/promptRouter.ts:343

          projectId: input.projectId,
          scope: "promptProtectedLabels:CUD",
          forbiddenErrorMessage: `You don't have permission to create a prompt with a protected label. Please contact your project admin for assistance.\n\n Protected labels are: ${protectedLabels.join(", ")}`,
        });
      }

      const prompt = await createPrompt({
        ...input,
        prisma: ctx.prisma,
        createdBy: ctx.session.user.id,
        user: {
          id: ctx.session.user.id,
          name: ctx.session.user.name ?? null,
          email: ctx.session.user.email ?? null,
        },
      });

      if (!prompt) {
        throw new Error("Failed to create prompt");
      }

      await auditLog(
        {
          session: ctx.session,
          resourceType: "prompt",
          resourceId: prompt.id,
          action: "create",
          after: prompt,
        },
        ctx.prisma,
      );

      return prompt;
    }),
  duplicatePrompt: protectedProjectProcedure
    .input(
      z.object({

View on GitHub (pinned to 59d92c7cf3)

Solutions

1. Check server logs for the surrounding Prisma call and any DB errors just before this throw
2. Verify the Prisma client version and that generated client matches packages/shared/prisma schema
3. If reproducible only in tests, ensure the test prisma mock returns a truthy object for prompt.create

try {
  await trpc.prompts.create.mutate(input);
} catch (e) {
  if (e instanceof TRPCClientError && e.message === 'Failed to create prompt') {
    // surface as internal error, check server logs
  }
  throw e;
}

When it happens

Trigger: Calling the tRPC mutation prompts.create (promptRouter.ts:343) with valid session/project and the underlying prisma.prompt.create unexpectedly returning undefined.

Common situations: Almost never fires in practice; if it does, suspect a Prisma version change, a mocked/stubbed prisma client in tests, or a database write that silently failed.

Related errors

• Failed to duplicate prompt: ${input.promptId}
• INTERNAL_SERVER_ERROR
• Failed to fetch upserted model
• CONFLICT
• NOT_FOUND

AI-assisted analysis of langfuse/langfuse@59d92c7cf3 (2026-08-27). Data as JSON: /api/errors/6f5b180373e327ab. Report an issue: GitHub.