AI Tar Fiend vs Nearheath Stalker crash

Describe the Bug:
AI thinking to cast Tar Fiend crashed game AI had only one creature on the battlefield, Nearheath Stalker.
Which card did behave improperly?
AI Tar Fiend
Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink dev 778ccb5 version - duel
What exactly should be the correct behavior/interaction?
Are any other cards possibly affected by this bug?
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AI thinking to cast Tar Fiend crashed game AI had only one creature on the battlefield, Nearheath Stalker.
- 1st of 5-6 errors | Open
Which card did behave improperly?
AI Tar Fiend
Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink dev 778ccb5 version - duel
What exactly should be the correct behavior/interaction?
Are any other cards possibly affected by this bug?
-