quest reward bug...

so as the title says... when i finished the quest from the shadow phantom to acquire gloves... when i clicked finish quest. my inventory was full thats why i cant get the item.. but before.,,i can just go and fix my inventory then click again to gain the reward.. but now i cant get the reward coz the quest is no longer there... help

btw the name of the quest is Put The Lost Tower to Sleep (1)....

 

Nothing you can do, sorry. Make sure you have clear inventory space next time, bad luck.