Browser crashes when ETH wallet is disabled

[srirambv]

Description

Browser crashes when ETH wallet is disabled

Steps to Reproduce

1. Create new profile on 0.23.501
2. Enable ETH Wallet, enter master password
3. Create New wallets ( i created about 15 of them)
4. Enable MetaMask wait for the extension to enable and opens MM tab
5. Go back to ETH and start creating a few more wallets (i did 5)
6. Disable ETH and it crashed the browser with following errors
7. Restart browser, starts fresh, ETH is disabled, Enabling ETH all wallets are still there but MM is disabled

Actual result:
Browser crashes when ETH wallet is disabled

Expected result:
Should not crash irrespective of MM status or ETH wallet enabled/disabled

Reproduces how often:
100%

Brave Version

Brave	0.25.501
V8	6.8.275.24
rev	775ecfa
Muon	8.0.7
OS Release	10.0.17134
Update Channel	Release
OS Architecture	x64
OS Platform	Microsoft Windows
Node.js	7.9.0
Brave Sync	v1.4.2
libchromiumcontent	68.0.3440.84

Reproducible on current live release:
No

Additional Information

[tildelowengrimm]

This might be fixed on the latest build. Please re-check to see if @ryanml's fixes resolve this.

[ryanml]

++ ^ A crash should no longer occur, thanks.