A method to fix trade blocked in the Free Market

Just discovered a way to get out of being trade-blocked in the Free Market:

1)DO NOT USE ALT-F4 TO EXIT MAPLE
2)Right click on any nearby player with monster farm
3)Go to the person's monster farm
4)Return to your own farm and exit monster life.
5)Things should return to normal.

I got trade blocked for the 2nd time and by a stroke of luck managed to get rid of that annoying bug.