FMDB executeupdate hangs when calling

Question

I am using FMDB to procedd sqlitedb in obj-c , but it hangs everytime i call executeupdate

BOOL isSuccess = YES;

[self openFMDB];
NSString* currentDatetime = [self getCurrentDatetime];

isSuccess = [fmDB executeUpdate:@"UPDATE liquors_list SET l_last_open = ? WHERE l_id = ?",[NSString stringWithFormat:@"%@",currentDatetime],[NSString stringWithFormat:@"%@",liquorID],Nil];

return isSuccess;