Fixes Gulp Missile freezing the game if when attacker fainted

src/battle_script_commands.c

@@ -17993,6 +17993,7 @@ void BS_TryActivateGulpMissile(void)
 
     if (!(gBattleStruct->moveResultFlags[gBattlerTarget] & MOVE_RESULT_NO_EFFECT)
         && !gProtectStructs[gBattlerAttacker].confusionSelfDmg
+        && IsBattlerAlive(gBattlerAttacker)
         && IsBattlerTurnDamaged(gBattlerTarget)
         && gBattleMons[gBattlerTarget].species != SPECIES_CRAMORANT
         && GetBattlerAbility(gBattlerTarget) == ABILITY_GULP_MISSILE)

src/battle_util.c

@@ -6092,6 +6092,7 @@ u32 AbilityBattleEffects(u32 caseID, u32 battler, u32 ability, u32 special, u32
              && !gProtectStructs[gBattlerAttacker].confusionSelfDmg
              && IsBattlerTurnDamaged(gBattlerTarget)
              && IsBattlerAlive(battler)
+             && IsBattlerAlive(gBattlerAttacker)
              && gBattleMons[gBattlerTarget].species != SPECIES_CRAMORANT)
             {
                 if (GetBattlerAbility(gBattlerAttacker) != ABILITY_MAGIC_GUARD)

test/battle/ability/gulp_missile.c

@@ -190,3 +190,13 @@ SINGLE_BATTLE_TEST("(Gulp Missile) Transformed Cramorant Gulping lowers defense
         HP_BAR(opponent);
     }
 }
+
+SINGLE_BATTLE_TEST("Gulp Missile triggered by explosion doesn't freeze the game")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_CRAMORANT);
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_SURF); MOVE(player, MOVE_EXPLOSION); }
+    }
+}