Assertion failure when playing Wild Warrior

[leper]

(It might be nice to also print the assertion to stdout or stderr so one can just copy it instead of having to copy it manually (as in writing the thing in an editor based on the window)).

Playing Wild Warrior sometimes results in hitting an assertion failure.

Assertion failed

formula_vm.cpp:449 ASSERTION FAILED: Assertion failed: Type mis-match. Expected
[[int,int,]] found null at in Virtual Machine: At  modules/citadel/data/cards-mi
nerva.cfg 647:
...oning.player_index].creature_avatar, []), value != summoning.targets[0])...
                                        ^

(Some VM state after the above, but that does not seem to be that relevant given that it is somewhat reproducible.)