'NoneType' object is not subscriptable の直し方を教えてください

前提

Python3で以下のプログラムを作成中に、エラーが発生しました。
実行結果を見るとLが途中からNoneになっていました。

実現したいこと

ここに実現したいことを箇条書きで書いてください。

[エラーをなくし正常に動くようにしたいです

発生している問題・エラーメッセージ

エラーメッセージ
'NoneType' object is not subscriptable

### 該当のソースコード

from copy import deepcopy

A=[1,1,1,1,1,1,1,1,1,1,1,1,1]

wk1=[30,50,104,30,30,30,30,30,37,30,30,30,30]
wk2=[43,50,100,64,30,30,32,30,44,30,30,30,31]
wk3=[68,50,114,77,31,30,34,30,52,30,30,30,36]
wk4=[91,50,117,96,31,30,35,30,56,30,30,30,43]
wk5=[97,50,114,108,33,30,35,30,61,30,30,30,48]
wk6=[94,50,113,109,30,30,35,30,63,30,30,30,56]
wk7=[91,50,111,107,30,30,35,30,65,30,30,30,60]
wk8=[91,64,100,107,30,30,35,30,64,30,30,30,77]
wk9=[89,59,91,104,30,30,35,30,59,30,30,30,79]
wk10=[87,60,78,94,30,30,35,31,52,30,30,30,65]
wk11=[80,75,56,79,30,30,34,32,56,30,30,30,48]
wk12=[72,79,56,67,30,30,32,34,45,41,30,30,44]
wk13=[60,75,45,49,30,30,30,34,40,44,30,30,33]


wh1=[30,63,117,110,30,39,30,30,30,30,30,30,33]
wh2=[67,55,86,63,30,42,33,30,33,30,30,30,33]
wh3=[68,58,88,70,30,42,37,30,37,30,33,30,37]
wh4=[64,65,96,89,30,49,36,30,37,30,35,30,42]
wh5=[83,62,95,98,30,54,34,30,38,30,35,30,45]
wh6=[91,57,92,99,30,56,34,30,38,30,35,30,49]
wh7=[88,54,91,99,30,55,34,30,35,30,35,30,56]
wh8=[84,54,91,99,30,53,33,30,35,30,35,30,60]
wh9=[83,53,90,99,30,49,33,30,35,30,35,30,62]
wh10=[82,56,94,90,30,51,30,30,35,30,35,30,70]
wh11=[77,55,71,84,30,61,30,30,34,30,40,30,52]
wh12=[75,50,85,74,35,60,30,30,31,30,36,30,63]
wh13=[65,46,110,59,35,43,30,30,31,30,30,30,50]

p=[12,11,13,10,9,5,7,3,6,8,1,4,2]
ps=[10,13,11,9,6,4,5,12,8,3,1,7,2]

m0=[2,1,3,7,4,4,4,6,6,4,3,7,6]
m1=[0,1,1,8,5,4,4,6,6,4,3,7,8]
m2=[1,0,2,7,3,4,2,5,5,3,1,5,5]
m3=[1,2,0,8,5,4,4,7,7,5,3,8,7]
m4=[8,7,8,0,7,3,6,1,2,4,5,4,3]
m5=[5,3,5,7,0,3,1,5,5,3,2,6,5]
m6=[4,4,4,3,3,0,2,2,2,1,1,3,2]
m7=[4,2,4,6,1,2,0,5,4,2,1,3,5]
m8=[6,5,7,1,5,2,5,0,1,3,3,2,3]
m9=[6,5,7,2,5,2,4,1,0,2,3,1,2]
m10=[4,3,5,4,3,1,2,3,2,0,1,2,3]
m11=[3,1,3,5,2,1,1,3,3,1,0,4,3]
m12=[8,5,8,4,6,3,3,2,1,2,4,0,1]
m13=[8,5,7,3,5,2,5,3,2,5,3,1,0]
r=780

def F(M,R,L,Ltmp,Fn,max,t):
	
	i=0
	j=-1
	W=[]
	
	for i in range(13):
		j+=1
	
		if R<=780 and R>720:
			W=wh1
		if R<=720 and R>660:
			W=wh2
		if R<=660 and R>600:
			W=wh3
		if R<=600 and R>540:
			W=wh4
		if R<=540 and R>480:
			W=wh5
		if R<=480 and R>420:
			W=wh6
		if R<=420 and R>360:
			W=wh7
		if R<=360 and R>300:
			W=wh8
		if R<=300 and R>240:
			W=wh9
		if R<=240 and R>180:
			W=wh10
		if R<=180 and R>120:
			W=wh11
		if R<=120 and R>60:
			W=wh12
		if R<=60 and R>0:
			W=wh13
		print(Fn,i,Ltmp,L,max)
		if M-W[i]>=0:
			L[1]-=W[i]
			L[2]-=W[i]
			Ltmp.append(i+1)
			L=F(L[1],L[2],L,Ltmp,Fn+1,max+p[i],W[i])
		
		
			
		
		if i==12 and M-W[i]<0:
			if max>Ltmp[0]:
				Ltmp[0]=max
				Ltmp[1]=L[1]
				Ltmp[2]=L[2]
				L=deepcopy(Ltmp)
			del Ltmp[Fn]
			L[1]+=t
			L[2]+=t
			return L
			
			
l=[]
l.append(0)
l.append(200)
l.append(r)
ltmp=[]
ltmp.append(0)
ltmp.append(200)
ltmp.append(r)
print(F(150,r,l,ltmp,0,0,0))
			

```ここに言語名を入力
Python3