Unable to create crowdsale - undefined NullFinalizeAgent contract address

[yfukata]

Quick help needed!

If you are reporting a problem with ICO Wizard, please include the following information:

Which network did you use? (Mainnet, Kovan, Rinkeby, etc.)

Mainnet

If you were able to create it, what is the URL of your crowdsale?

Unable to create crowdsale, but files were downloadable.
The same phenomenon occurred the last time I tried to create a crowdsale, couple hours ago.
When I look into NullFinalizeAgentExt text files, the contract addresses for all tiers were undefined.

Do you have screenshots showing the problem?

Do you see errors in the dev console? If yes, please include a screenshot

Sorry, perhaps because I proceeded to "CONTINUE," I think I missed a chance to take a screenshot.
If downloaded files are needed, please let me know.

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Thank you for your help!

[yfukata]

Same failure occurred again; this time I captured a screenshot :

[vbaranov]

Relates to #457