paperclipai/paperclip · error · Error

SQL placeholder $${match[1]} has no matching parameter

Error message

SQL placeholder $${match[1]} has no matching parameter

What it means

Parameter-binding guard in bindSql: the statement contains a $n placeholder whose index is not an integer in the 1..params.length range, so the placeholder refers to a parameter the caller never supplied. The mismatched placeholder/params pair is at fault.

Source

Thrown at server/src/services/plugin-database.ts:314

  for (const ref of refs) {
    if (ref.schema !== namespace) {
      throw new Error("ctx.db.execute cannot reference public or other non-plugin schemas");
    }
  }
}

function bindSql(statement: string, params: readonly unknown[] = []): SQL {
  // Safe only after callers run the plugin SQL validators above.
  if (params.length === 0) return sql.raw(statement);
  const chunks: SQL[] = [];
  let cursor = 0;
  const placeholderPattern = /\$(\d+)/g;
  const seen = new Set<number>();

  for (const match of statement.matchAll(placeholderPattern)) {
    const index = Number(match[1]);
    if (!Number.isInteger(index) || index < 1 || index > params.length) {
      throw new Error(`SQL placeholder $${match[1]} has no matching parameter`);
    }
    chunks.push(sql.raw(statement.slice(cursor, match.index)));
    chunks.push(sql`${params[index - 1]}`);
    seen.add(index);
    cursor = match.index! + match[0].length;
  }
  chunks.push(sql.raw(statement.slice(cursor)));
  if (seen.size !== params.length) {
    throw new Error("Every ctx.db parameter must be referenced by a $n placeholder");
  }
  return sql.join(chunks, sql.raw(""));
}

async function listSqlMigrationFiles(migrationsDir: string): Promise<string[]> {
  const entries = await readdir(migrationsDir, { withFileTypes: true });
  return entries
    .filter((entry) => entry.isFile() && entry.name.endsWith(".sql"))
    .map((entry) => entry.name)

View on GitHub (pinned to 120ae5428f)

Solutions

1. Add a parameter for every $n placeholder in the SQL, or remove the unmatched placeholder.

When it happens

Trigger: Thrown at server/src/services/plugin-database.ts:314 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of paperclipai/paperclip@120ae5428f (2026-08-18). Data as JSON: /api/errors/d2724a6545b182fa. Report an issue: GitHub.