if the last line of the javascript file is a comment with no new line at the end of it,  then the command "Minimize current file" produces this output:

/Library/Application Support/TextMate/Bundles/JavaScript Tools.tmbundle/Support/bin/jsmin.rb:73:in `<=': comparison of Fixnum with String failed (ArgumentError)

from /Library/Application Support/TextMate/Bundles/JavaScript Tools.tmbundle/Support/bin/jsmin.rb:73:in `mynext'

from /Library/Application Support/TextMate/Bundles/JavaScript Tools.tmbundle/Support/bin/jsmin.rb:122:in `action'

from /Library/Application Support/TextMate/Bundles/JavaScript Tools.tmbundle/Support/bin/jsmin.rb:168:in `jsmin'

from /Library/Application Support/TextMate/Bundles/JavaScript Tools.tmbundle/Support/bin/jsmin.rb:197

The problem lying in the mynext method of jsmin.rb, where the while(true) loop checking for the end of the comment doesn't check for EOF. should be a simple fix.