staking plan for each loosing round

hello,

i want to use a staking plan whic bet a specific amount every loosing round. if i win a bet i want to start with the default stake.

a example:
1. bet: 2€ -> loss
2. bet: 3€ -> loss
3. bet: 5€ -> loss
4. bet: 7€ -> loss
5. bet: 12€ -> win

start again with betting 2€

max. rounds 6, i want to configure the betting stake per loosing round

actually my problem is that a round with no betting (because the odds are to high) also return a negativ value for "channels last p/l". Therefore, the stake grow up even though I do not bet.