Question about Table columns update behavior causing "Cannot read properties of null" error

[Lin-Yu-Hung]

I encountered an issue with the PrimeNG Table component (version 17.18.0) when dynamically updating table columns.

Current Behavior & Issue:
When updating table columns directly without clearing them first, I get multiple "Uncaught TypeError: Cannot read properties of null" errors. This happens only on subsequent updates, not during the initial rendering.

Example of code that causes the error:

// This causes the error on subsequent updates
async updateTableCols() {
  const type = await getType(); // get some type
  switch (type) {
    case 'A':
      this.tableCols = [...columnsForTypeA];
      break;
    case 'B':
      this.tableCols = [...columnsForTypeB];
      break;
  }
}