Google Sheets – Dynamic Query Using TRUE or FALSE

The new version of Google Sheets makes it very simple: hit the Enter key while you're in the cell. Boom. Dropdown list.

When stacking arrays vertically, they must have the same number of columns. In case of an error, query outputs a single cell with #REF or #N/A or another message. You put iferror wrapper around it, but that only makes it so the output is one empty cell. Problem is, it is one cell and you need 8 columns to match the other array.

Solution: add a blank row with 8 cells as the second argument of iferror, to be used in case of errors.

=SORT(ArrayFormula({
 IFERROR(QUERY('5 Star Clubs (Hidden)'!A6:Z, 
  "select A, B, C, D, E, F, H, I 
   where A != ' ' AND F IS NOT NULL"),  
 {"","","","","","","",""}); 
 IFERROR(QUERY('5 Star Gear Clubs (Hidden)'!A6:Z, 
  "select A, B, C, D, E, G, H, I 
   where A != ' ' AND F IS NULL"),
 {"","","","","","","",""})
 }),7,FALSE)

Specifically, the error occurs because there is no sheet named '5 Star Gear Clubs (Hidden)'. Suggestion: when a formula throws an error, enter its parts in separate cells (without iferror wrappers) to see what they do.