Background colors not updated on sorting table by column

[elpres]

If you run a query in the "Execute SQL" tab and get a result containing NULL values, these cells are displayed with a pink background (so far everything is fine). If you then change the order of rows by clicking one of the column headers, the data is reordered properly, but the pink highlights stay in the rows they were at the start, regardless of whether the value in this cell is now NULL or not.

This is happening Firefox with extension version 0.8.3.1