diff --git a/src/phases.ts b/src/phases.ts
index d77ff7c29df..dfadcaf2767 100644
--- a/src/phases.ts
+++ b/src/phases.ts
@@ -4449,9 +4449,10 @@ export class SwitchPhase extends BattlePhase {
 
   start() {
     super.start();
+    const availablePartyMembers = this.scene.getParty().filter(p => !p.isFainted());
 
     // Skip modal switch if impossible
-    if (this.isModal && !this.scene.getParty().filter(p => p.isAllowedInBattle() && !p.isActive(true)).length) {
+    if (this.isModal && (!availablePartyMembers.filter(p => !p.isActive(true)).length || (!this.scene.currentBattle.started && availablePartyMembers.length === 1))) {
       return super.end();
     }
 
@@ -4461,7 +4462,7 @@ export class SwitchPhase extends BattlePhase {
     }
 
     // Override field index to 0 in case of double battle where 2/3 remaining legal party members fainted at once
-    const fieldIndex = this.scene.currentBattle.getBattlerCount() === 1 || this.scene.getParty().filter(p => p.isAllowedInBattle()).length > 1 ? this.fieldIndex : 0;
+    const fieldIndex = this.scene.currentBattle.getBattlerCount() === 1 || availablePartyMembers.length > 1 ? this.fieldIndex : 0;
 
     this.scene.ui.setMode(Mode.PARTY, this.isModal ? PartyUiMode.FAINT_SWITCH : PartyUiMode.POST_BATTLE_SWITCH, fieldIndex, (slotIndex: integer, option: PartyOption) => {
       if (slotIndex >= this.scene.currentBattle.getBattlerCount() && slotIndex < 6) {