Collectible Card Game Headquarters

Describe the Bug:
Had some random crashes recently, only shared card is Stern Mentor (and crashes all happened after soulbonding). Dump is below.

Which card did behave improperly ?
Stern Mentor???

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
2014/05/06: Journey into Nyx

What exactly should be the correct behavior/interaction ?
No crash.

Are any other cards possibly affected by this bug ?
-

bad parameters
get_card_instance(-1, -1)
0: 0x0236D5D4
1: 0x0232F235
2: 0x0236FEB9
3: 0x0237042D
4: 0x0203847C
5: 0x02378335
6: 0x023387E3
7: 0x02339364
8: 0x0233472A
9: 0x00477D81
10: 0x02330C60
11: 0x004AFFBC
12: 0x004B0930
13: 0x0043C61D
14: 0x004399BD
15: 0x0047902C
16: 0x004946E9
17: 0x7592338A
18: 0x77C79F72
19: 0x77C79F45

confirmed, also I noticed that Stern Mentor doesn't give choice on which paired creature to tap when both are available to activate the ability, Stern Mentor tap itself first.

bad parameters
get_card_instance(-1, -1)
0: 0x0236D5D4
1: 0x0232F235
2: 0x0236FEB9
3: 0x0237042D
4: 0x0203847C
5: 0x02378335
6: 0x023387E3
7: 0x004779D9
8: 0x004768B7
9: 0x00475C5D
10: 0x0233813B
11: 0x023385E7
12: 0x004371B4
13: 0x004A66AE
14: 0x004A423A
15: 0x021CF894
16: 0x004018E0
17: 0x00435BCF
18: 0x004368C6
19: 0x023368AC
20: 0x0043BFAA
21: 0x004399BD
22: 0x0047902C
23: 0x004946E9
24: 0x7C80B713

Pop up appeared on AI turn at end step following up by a crash and when AI try to cast it.

Well, I didn't find any obvious reason, but I refreshed the code anyway in 7766877
Hope this will fix the bug.

Tested 2 games for more than a dozen turns with no crash, so this s closed unless/until it crops up again.