Haskell - list traversing

I want to traverse list of lists and check every element if its equal a char or not. How can I do this? I get an error even when I write if statement. I would be glad if you can help.

example list that I want to traverse:

maze = [ ['E','#','#','#'],
       [' ','#',' ',' '],
       [' ',' ',' ',' '],
       ['#','#','#','S'] ]

If statement:

checkElement :: Char -> Bool
checkElement x = if x == '#'
  then False
  else True