fix possible crash on matchmaking when invites are removed
fix possible crash on matchmaking when invites are removed

ycaihua/wizardwar,ycaihua/wizardwar,seanhess/wizardwar,ycaihua/wizardwar,seanhess/wizardwar,seanhess/wizardwar,seanhess/wizardwar,seanhess/wizardwar,seanhess/wizardwar,ycaihua/wizardwar,ycaihua/wizardwar,ycaihua/wizardwar,seanhess/wizardwar