BookStackApp/BookStack · error · Error

TableMap Error: Attempted to get cell ${position+1} of ${thi

Error message

TableMap Error: Attempted to get cell ${position+1} of ${this.cells.length}

What it means

Bounds guard in TableMap.getCellAtPosition: the computed (y*columnCount)+x position is >= the filled cell list length, i.e. a lookup ran past the table map's known cells — usually after the map went stale relative to the actual table DOM/nodes. Input at fault: x/y coordinates outside the mapped grid.

Source

Thrown at resources/js/wysiwyg/utils/table-map.ts:79

        let lastCell: TableCellNode = rowsAndCells[0][0];
        for (let y = 0; y < this.rowCount; y++) {
            for (let x = 0; x < this.columnCount; x++) {
                if (!rowsAndCells[y] || !rowsAndCells[y][x]) {
                    cells.push(lastCell);
                } else {
                    cells.push(rowsAndCells[y][x]);
                    lastCell = rowsAndCells[y][x];
                }
            }
        }

        this.cells = cells;
    }

    public getCellAtPosition(x: number, y: number): TableCellNode {
        const position = (y * this.columnCount) + x;
        if (position >= this.cells.length) {
            throw new Error(`TableMap Error: Attempted to get cell ${position+1} of ${this.cells.length}`);
        }

        return this.cells[position];
    }

    public getCellsInRange(range: CellRange): TableCellNode[] {
        const minX = Math.max(Math.min(range.fromX, range.toX), 0);
        const maxX = Math.min(Math.max(range.fromX, range.toX), this.columnCount - 1);
        const minY = Math.max(Math.min(range.fromY, range.toY), 0);
        const maxY = Math.min(Math.max(range.fromY, range.toY), this.rowCount - 1);

        const cells = new Set<TableCellNode>();

        for (let y = minY; y <= maxY; y++) {
            for (let x = minX; x <= maxX; x++) {
                cells.add(this.getCellAtPosition(x, y));
            }
        }

View on GitHub (pinned to 18f8469a1c)

Solutions

1. Rebuild the TableMap from the current table DOM before cell lookups
2. Clamp x/y to rowCount-1/columnCount-1 before calling getCellAtPosition
3. Check the callers (relCell, getCellsInRange, headCell) use valid in-range coordinates

When it happens

Trigger: Thrown at resources/js/wysiwyg/utils/table-map.ts:79 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BookStackApp/BookStack@18f8469a1c (2026-09-02). Data as JSON: /api/errors/af36cbd5aa0521e0. Report an issue: GitHub.