ok this might even be a better option to run the prompt command in the background

autojump.bash

@@ -9,6 +9,6 @@ _autojump()
         return 0
 }
 complete -F _autojump j
-export PROMPT_COMMAND='autojump -a "$(pwd -P)"'
+export PROMPT_COMMAND='(autojump -a "$(pwd -P)"&)>/dev/null'
 alias jumpstat="autojump --stat"
 function j { new_path="$(autojump $@)";if [ -n "$new_path" ]; then echo -e "\\033[31m${new_path}\\033[0m"; echo; cd "$new_path";fi }