diff --git a/src/client/Transport.ts b/src/client/Transport.ts
index 0e7a07030..c4fd5f700 100644
--- a/src/client/Transport.ts
+++ b/src/client/Transport.ts
@@ -308,7 +308,7 @@ export class Transport {
     this.sendIntent({
       type: "allianceRequest",
       clientID: this.lobbyConfig.clientID,
-      requestor: event.requestor.id(),
+      playerID: event.requestor.id(),
       recipient: event.recipient.id(),
     });
   }
@@ -318,7 +318,7 @@ export class Transport {
       type: "allianceRequestReply",
       clientID: this.lobbyConfig.clientID,
       requestor: event.requestor.id(),
-      recipient: event.recipient.id(),
+      playerID: event.recipient.id(),
       accept: event.accepted,
     });
   }
@@ -327,7 +327,7 @@ export class Transport {
     this.sendIntent({
       type: "breakAlliance",
       clientID: this.lobbyConfig.clientID,
-      requestor: event.requestor.id(),
+      playerID: event.requestor.id(),
       recipient: event.recipient.id(),
     });
   }
@@ -349,7 +349,7 @@ export class Transport {
     this.sendIntent({
       type: "attack",
       clientID: this.lobbyConfig.clientID,
-      attackerID: this.lobbyConfig.playerID,
+      playerID: this.lobbyConfig.playerID,
       targetID: event.targetID,
       troops: event.troops,
     });
@@ -359,7 +359,7 @@ export class Transport {
     this.sendIntent({
       type: "boat",
       clientID: this.lobbyConfig.clientID,
-      attackerID: this.lobbyConfig.playerID,
+      playerID: this.lobbyConfig.playerID,
       targetID: event.targetID,
       troops: event.troops,
       x: event.cell.x,
@@ -371,7 +371,7 @@ export class Transport {
     this.sendIntent({
       type: "targetPlayer",
       clientID: this.lobbyConfig.clientID,
-      requestor: this.lobbyConfig.playerID,
+      playerID: this.lobbyConfig.playerID,
       target: event.targetID,
     });
   }
@@ -380,7 +380,7 @@ export class Transport {
     this.sendIntent({
       type: "emoji",
       clientID: this.lobbyConfig.clientID,
-      sender: this.lobbyConfig.playerID,
+      playerID: this.lobbyConfig.playerID,
       recipient:
         event.recipient == AllPlayers ? AllPlayers : event.recipient.id(),
       emoji: event.emoji,
@@ -391,7 +391,7 @@ export class Transport {
     this.sendIntent({
       type: "donate",
       clientID: this.lobbyConfig.clientID,
-      sender: event.sender.id(),
+      playerID: event.sender.id(),
       recipient: event.recipient.id(),
       troops: event.troops,
     });
@@ -401,7 +401,7 @@ export class Transport {
     this.sendIntent({
       type: "troop_ratio",
       clientID: this.lobbyConfig.clientID,
-      player: this.lobbyConfig.playerID,
+      playerID: this.lobbyConfig.playerID,
       ratio: event.ratio,
     });
   }
@@ -410,7 +410,7 @@ export class Transport {
     this.sendIntent({
       type: "build_unit",
       clientID: this.lobbyConfig.clientID,
-      player: this.lobbyConfig.playerID,
+      playerID: this.lobbyConfig.playerID,
       unit: event.unit,
       x: event.cell.x,
       y: event.cell.y,
diff --git a/src/core/Schemas.ts b/src/core/Schemas.ts
index f8796c725..eb81c6698 100644
--- a/src/core/Schemas.ts
+++ b/src/core/Schemas.ts
@@ -133,11 +133,12 @@ const BaseIntentSchema = z.object({
     "build_unit",
   ]),
   clientID: ID,
+  playerID: ID,
 });
 
 export const AttackIntentSchema = BaseIntentSchema.extend({
   type: z.literal("attack"),
-  attackerID: ID,
+  playerID: ID,
   targetID: ID.nullable(),
   troops: z.number().nullable(),
 });
@@ -154,7 +155,7 @@ export const SpawnIntentSchema = BaseIntentSchema.extend({
 
 export const BoatAttackIntentSchema = BaseIntentSchema.extend({
   type: z.literal("boat"),
-  attackerID: ID,
+  playerID: ID,
   targetID: ID.nullable(),
   troops: z.number().nullable(),
   x: z.number(),
@@ -163,52 +164,52 @@ export const BoatAttackIntentSchema = BaseIntentSchema.extend({
 
 export const AllianceRequestIntentSchema = BaseIntentSchema.extend({
   type: z.literal("allianceRequest"),
-  requestor: ID,
+  playerID: ID,
   recipient: ID,
 });
 
 export const AllianceRequestReplyIntentSchema = BaseIntentSchema.extend({
   type: z.literal("allianceRequestReply"),
   requestor: ID, // The one who made the original alliance request
-  recipient: ID,
+  playerID: ID,
   accept: z.boolean(),
 });
 
 export const BreakAllianceIntentSchema = BaseIntentSchema.extend({
   type: z.literal("breakAlliance"),
-  requestor: ID, // The one who made the original alliance request
+  playerID: ID,
   recipient: ID,
 });
 
 export const TargetPlayerIntentSchema = BaseIntentSchema.extend({
   type: z.literal("targetPlayer"),
-  requestor: ID,
+  playerID: ID,
   target: ID,
 });
 
 export const EmojiIntentSchema = BaseIntentSchema.extend({
   type: z.literal("emoji"),
-  sender: ID,
+  playerID: ID,
   recipient: z.union([ID, z.literal(AllPlayers)]),
   emoji: EmojiSchema,
 });
 
 export const DonateIntentSchema = BaseIntentSchema.extend({
   type: z.literal("donate"),
-  sender: ID,
+  playerID: ID,
   recipient: ID,
   troops: z.number().nullable(),
 });
 
 export const TargetTroopRatioIntentSchema = BaseIntentSchema.extend({
   type: z.literal("troop_ratio"),
-  player: ID,
+  playerID: ID,
   ratio: z.number().min(0).max(1),
 });
 
 export const BuildUnitIntentSchema = BaseIntentSchema.extend({
   type: z.literal("build_unit"),
-  player: ID,
+  playerID: ID,
   unit: z.nativeEnum(UnitType),
   x: z.number(),
   y: z.number(),
diff --git a/src/core/execution/ExecutionManager.ts b/src/core/execution/ExecutionManager.ts
index b7e3f2c92..e876c9cac 100644
--- a/src/core/execution/ExecutionManager.ts
+++ b/src/core/execution/ExecutionManager.ts
@@ -33,6 +33,7 @@ import { DonateExecution } from "./DonateExecution";
 import { SetTargetTroopRatioExecution } from "./SetTargetTroopRatioExecution";
 import { ConstructionExecution } from "./ConstructionExecution";
 import { fixProfaneUsername, isProfaneUsername } from "../validations/username";
+import { NoOpExecution } from "./NoOpExecution";
 
 export class Executor {
   // private random = new PseudoRandom(999)
@@ -52,11 +53,26 @@ export class Executor {
   }
 
   createExec(intent: Intent): Execution {
+    if (intent.type != "spawn") {
+      if (!this.mg.hasPlayer(intent.playerID)) {
+        console.warn(
+          `player ${intent.playerID} not found on intent ${intent.type}`,
+        );
+        return new NoOpExecution();
+      }
+      const player = this.mg.player(intent.playerID);
+      if (player.clientID() != intent.clientID) {
+        console.warn(
+          `intent ${intent.type} has incorrect clientID ${intent.clientID} for player ${player.name()} with clientID ${player.clientID()}`,
+        );
+        return new NoOpExecution();
+      }
+    }
     switch (intent.type) {
       case "attack": {
         return new AttackExecution(
           intent.troops,
-          intent.attackerID,
+          intent.playerID,
           intent.targetID,
           null,
         );
@@ -77,40 +93,40 @@ export class Executor {
         );
       case "boat":
         return new TransportShipExecution(
-          intent.attackerID,
+          intent.playerID,
           intent.targetID,
           this.mg.ref(intent.x, intent.y),
           intent.troops,
         );
       case "allianceRequest":
-        return new AllianceRequestExecution(intent.requestor, intent.recipient);
+        return new AllianceRequestExecution(intent.playerID, intent.recipient);
       case "allianceRequestReply":
         return new AllianceRequestReplyExecution(
           intent.requestor,
-          intent.recipient,
+          intent.playerID,
           intent.accept,
         );
       case "breakAlliance":
-        return new BreakAllianceExecution(intent.requestor, intent.recipient);
+        return new BreakAllianceExecution(intent.playerID, intent.recipient);
       case "targetPlayer":
-        return new TargetPlayerExecution(intent.requestor, intent.target);
+        return new TargetPlayerExecution(intent.playerID, intent.target);
       case "emoji":
         return new EmojiExecution(
-          intent.sender,
+          intent.playerID,
           intent.recipient,
           intent.emoji,
         );
       case "donate":
         return new DonateExecution(
-          intent.sender,
+          intent.playerID,
           intent.recipient,
           intent.troops,
         );
       case "troop_ratio":
-        return new SetTargetTroopRatioExecution(intent.player, intent.ratio);
+        return new SetTargetTroopRatioExecution(intent.playerID, intent.ratio);
       case "build_unit":
         return new ConstructionExecution(
-          intent.player,
+          intent.playerID,
           this.mg.ref(intent.x, intent.y),
           intent.unit,
         );
diff --git a/src/core/execution/MIRVExecution.ts b/src/core/execution/MIRVExecution.ts
index f865eea75..87638fe7b 100644
--- a/src/core/execution/MIRVExecution.ts
+++ b/src/core/execution/MIRVExecution.ts
@@ -43,7 +43,7 @@ export class MirvExecution implements Execution {
   ) {}
 
   init(mg: Game, ticks: number): void {
-    if (!this.mg.hasPlayer(this.senderID)) {
+    if (!mg.hasPlayer(this.senderID)) {
       console.warn(`MIRVExecution: player ${this.senderID} not found`);
       this.active = false;
       return;
diff --git a/src/core/execution/NoOpExecution.ts b/src/core/execution/NoOpExecution.ts
new file mode 100644
index 000000000..eefce20ed
--- /dev/null
+++ b/src/core/execution/NoOpExecution.ts
@@ -0,0 +1,15 @@
+import { Execution, Game, Player } from "../game/Game";
+
+export class NoOpExecution implements Execution {
+  isActive(): boolean {
+    return false;
+  }
+  activeDuringSpawnPhase(): boolean {
+    return false;
+  }
+  init(mg: Game, ticks: number): void {}
+  tick(ticks: number): void {}
+  owner(): Player {
+    return null;
+  }
+}
diff --git a/src/core/execution/alliance/AllianceRequestExecution.ts b/src/core/execution/alliance/AllianceRequestExecution.ts
index c5a20843a..21128d840 100644
--- a/src/core/execution/alliance/AllianceRequestExecution.ts
+++ b/src/core/execution/alliance/AllianceRequestExecution.ts
@@ -19,6 +19,21 @@ export class AllianceRequestExecution implements Execution {
   ) {}
 
   init(mg: Game, ticks: number): void {
+    if (!mg.hasPlayer(this.requestorID)) {
+      console.warn(
+        `AllianceRequestExecution requester ${this.requestorID} not found`,
+      );
+      this.active = false;
+      return;
+    }
+    if (!mg.hasPlayer(this.recipientID)) {
+      console.warn(
+        `AllianceRequestExecution recipient ${this.recipientID} not found`,
+      );
+      this.active = false;
+      return;
+    }
+
     this.mg = mg;
     this.requestor = mg.player(this.requestorID);
     this.recipient = mg.player(this.recipientID);
diff --git a/src/core/execution/alliance/AllianceRequestReplyExecution.ts b/src/core/execution/alliance/AllianceRequestReplyExecution.ts
index 4250d476a..d0c0d4688 100644
--- a/src/core/execution/alliance/AllianceRequestReplyExecution.ts
+++ b/src/core/execution/alliance/AllianceRequestReplyExecution.ts
@@ -20,6 +20,20 @@ export class AllianceRequestReplyExecution implements Execution {
   ) {}
 
   init(mg: Game, ticks: number): void {
+    if (!mg.hasPlayer(this.requestorID)) {
+      console.warn(
+        `AllianceRequestReplyExecution requester ${this.requestorID} not found`,
+      );
+      this.active = false;
+      return;
+    }
+    if (!mg.hasPlayer(this.recipientID)) {
+      console.warn(
+        `AllianceRequestReplyExecution recipient ${this.recipientID} not found`,
+      );
+      this.active = false;
+      return;
+    }
     this.mg = mg;
     this.requestor = mg.player(this.requestorID);
     this.recipient = mg.player(this.recipientID);
diff --git a/src/core/execution/alliance/BreakAllianceExecution.ts b/src/core/execution/alliance/BreakAllianceExecution.ts
index 2beff3d8a..074e72ab7 100644
--- a/src/core/execution/alliance/BreakAllianceExecution.ts
+++ b/src/core/execution/alliance/BreakAllianceExecution.ts
@@ -19,6 +19,20 @@ export class BreakAllianceExecution implements Execution {
   ) {}
 
   init(mg: Game, ticks: number): void {
+    if (!mg.hasPlayer(this.requestorID)) {
+      console.warn(
+        `BreakAllianceExecution requester ${this.requestorID} not found`,
+      );
+      this.active = false;
+      return;
+    }
+    if (!mg.hasPlayer(this.recipientID)) {
+      console.warn(
+        `BreakAllianceExecution: recipient ${this.recipientID} not found`,
+      );
+      this.active = false;
+      return;
+    }
     this.requestor = mg.player(this.requestorID);
     this.recipient = mg.player(this.recipientID);
     this.mg = mg;