octobercms/october · error · Error

Cannot find TH element for the Inspector row

Error message

Cannot find TH element for the Inspector row

What it means

Error "Cannot find TH element for the Inspector row" thrown in octobercms/october.

Source

Thrown at modules/backend/assets/foundation/controls/inspector/inspector.surface.js:405

            row.setAttribute('data-group-index', this.getGroupManager().getGroupIndex(group))
            row.setAttribute('data-parent-group-index', this.getGroupManager().getGroupIndex(group.parentGroup))
        }
        else {
            if (group.parentGroup) {
                row.setAttribute('data-parent-group-index', this.getGroupManager().getGroupIndex(group))
            }
        }
    }

    Surface.prototype.applyGroupLevelToRow = function(row, group) {
        if (row.hasAttribute('data-group-level')) {
            return;
        }

        var th = this.getRowHeadElement(row);

        if (th === null) {
            throw new Error('Cannot find TH element for the Inspector row');
        }

        var groupLevel = group.getLevel();

        row.setAttribute('data-group-level', groupLevel)
        th.children[0].style.marginLeft = groupLevel*10 + 'px'
    }

    Surface.prototype.toggleGroup = function(row, forceExpand) {
        var link = row.querySelector('a'),
            groupIndex = row.getAttribute('data-group-index'),
            table = this.getRootTable(),
            groupManager = this.getGroupManager(),
            collapse = true

        if ($.oc.foundation.element.hasClass(link, 'expanded') && !forceExpand) {
            $.oc.foundation.element.removeClass(link, 'expanded')
        }

View on GitHub (pinned to b608633a7e)

When it happens

Trigger: Thrown at modules/backend/assets/foundation/controls/inspector/inspector.surface.js:405 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of octobercms/october@b608633a7e (2026-08-21). Data as JSON: /api/errors/24f9108771410e95. Report an issue: GitHub.