dani-garcia/vaultwarden · error · Error

msg

Error message

msg

What it means

This throw comes from DataTables' internal error reporter (the _fnLog/errMode mechanism). DataTables raises internal errors such as 'Requested unknown parameter', 'Invalid JSON response', 'Cannot reinitialise DataTable', or 'Non-table node initialisation'; depending on the errMode setting it logs to console, alerts, fires the 'dt-error' event, throws an Error, or hands the message to a custom function. When errMode is 'throw', those internal warnings become hard exceptions that stop execution.

Source

Thrown at src/static/scripts/datatables.js:3990

            (ctx ? 'table id=' + ctx.tableId + ' - ' : '') +
            msg;
    if (tn) {
        msg +=
            '. For more information about this error, please see ' +
                'https://datatables.net/tn/' +
                tn;
    }
    {
        // Backwards compatibility pre 1.10
        var type = ext.sErrMode || ext.errMode;
        if (ctx) {
            callbackFire(ctx, null, 'dt-error', [ctx, tn, msg], true);
        }
        if (type == 'alert') {
            alert(msg);
        }
        else if (type == 'throw') {
            throw new Error(msg);
        }
        else if (typeof type == 'function') {
            type(ctx, tn, msg);
        }
    }
}
/**
 * See if a property is defined on one object, if so assign it to the other
 * object
 *
 * @param ret target object
 * @param src source object
 * @param name property
 * @param mappedName name to map too - optional, name used if not given
 */
function map(ret, src, name, mappedName) {
    if (Array.isArray(name)) {
        for (let i = 0; i < name.length; i++) {

View on GitHub (pinned to 6729e83521)

Solutions

1. Fix the underlying message shown in the error: align columns.data with the actual JSON payload fields, or repair the Ajax endpoint so it returns valid JSON.
2. If you only want to observe errors without crashing, set errMode: 'alert' (default) or 'console', or register $.fn.DataTable.ext.errMode = function(ctx, tn, msg) { ... } to handle messages yourself.
3. Wrap table construction and row processing in try/catch when running in throw mode so one bad row does not abort the whole page.
4. Listen for the 'dt-error' event (callbackFire emits it before throwing) to log failures centrally.
5. Validate the Ajax response shape before initialising or reloading the table (check data is an array, fields exist).

Example fix

// before
$('#table').DataTable({
  ajax: '/api/rows',
  errMode: 'throw', // hard crash on any internal error
  columns: [{ data: 'userName' }] // payload actually has `user_name`
});
// after
$('#table').DataTable({
  ajax: '/api/rows',
  errMode: function (ctx, tn, msg) { console.error('DataTables:', msg); },
  columns: [{ data: 'user_name' }]
});

function validatePayloadForTable(payload, columns) {
  if (!Array.isArray(payload.data))
    throw new Error('Ajax source must return { data: [...] }');
  for (const col of columns) {
    if (typeof col.data === 'string' && payload.data.length &&
        !(col.data in payload.data[0])) {
      console.warn('Column field missing in payload:', col.data);
    }
  }
}
// call before table.ajax.reload() or initialisation; also check errMode:
// if ($.fn.DataTable.ext.errMode === 'throw') { /* wrap usage in try/catch */ }

function isErrMode(mode) {
  return mode === 'alert' || mode === 'throw' ||
    mode === 'console' || typeof mode === 'function';
}
function throwsOnError(tableInit) {
  return tableInit && tableInit.errMode === 'throw';
}

try {
  const table = $('#table').DataTable({ errMode: 'throw', ajax: '/api/rows', columns });
  table.ajax.reload(null, false);
} catch (e) {
  if (String(e.message).startsWith('DataTables warning')) {
    // DataTables internal error (unknown parameter, invalid JSON, reinit...)
    console.error('DataTables:', e.message);
    showErrorToast(e.message);
  } else { throw e; }
}

When it happens

Trigger: Setting `errMode: 'throw'` (on the instance or via $.fn.DataTable.ext.errMode = 'throw') and then triggering any internal DataTables error — e.g. a column references a data property that is undefined ('Requested unknown parameter'), the Ajax source returns invalid JSON, calling $(...).DataTable() on an already-initialised table, or passing a non-table node to the constructor.

Common situations: Applications that set errMode to 'throw' to catch data problems in production; Ajax endpoints returning HTML error pages instead of JSON after a deploy; renaming server fields without updating columns.data; double-initialising a table whose markup is re-rendered by a framework; custom type callbacks receiving ctx/tn/msg instead of an exception.

Related errors

• Cannot set prototype values
• ConfigInvalid
• Failed to parse global log level
• Failed to parse overrides

AI-assisted analysis of dani-garcia/vaultwarden@6729e83521 (2026-09-02). Data as JSON: /api/errors/39534a82e5f48fef. Report an issue: GitHub.