diff --git a/src/ts/missions/generator.ts b/src/ts/missions/generator.ts
index d47cec793..763769683 100644
--- a/src/ts/missions/generator.ts
+++ b/src/ts/missions/generator.ts
@@ -5,8 +5,9 @@ import { SightSeeingMission, SightSeeingType } from "./sightSeeingMission";
 import { uniformRandBool } from "extended-random";
 import { BodyType } from "../architecture/bodyType";
 import { SystemObjectType } from "../saveFile/universeCoordinates";
+import { Player } from "../player/player";
 
-export function generateSightseeingMissions(spaceStationModel: SpaceStationModel, timestampMillis: number): SightSeeingMission[] {
+export function generateSightseeingMissions(spaceStationModel: SpaceStationModel, player: Player, timestampMillis: number): SightSeeingMission[] {
     const hours = Math.floor(timestampMillis / 1000 / 60 / 60);
 
     const starSystem = spaceStationModel.starSystem;
@@ -63,5 +64,8 @@ export function generateSightseeingMissions(spaceStationModel: SpaceStationModel
         });
     });
 
-    return blackHoleFlyByMissions.concat(neutronStarFlyByMissions, anomalyFlyByMissions);
+    const allMissions = blackHoleFlyByMissions.concat(neutronStarFlyByMissions, anomalyFlyByMissions);
+
+    // filter missions to avoid duplicates with already accepted missions of the player
+    return allMissions.filter((mission) => player.currentMissions.every((currentMission) => !mission.equals(currentMission)));
 }
diff --git a/src/ts/ui/spaceStation/spaceStationMissions.ts b/src/ts/ui/spaceStation/spaceStationMissions.ts
index 5eec24294..182a72d26 100644
--- a/src/ts/ui/spaceStation/spaceStationMissions.ts
+++ b/src/ts/ui/spaceStation/spaceStationMissions.ts
@@ -11,7 +11,7 @@ import { Player } from "../../player/player";
 import { MissionContainer } from "./missionContainer";
 
 export function generateMissionsDom(stationModel: SpaceStationModel, player: Player): HTMLDivElement {
-    const sightSeeingMissions = generateSightseeingMissions(stationModel, Date.now());
+    const sightSeeingMissions = generateSightseeingMissions(stationModel, player, Date.now());
 
     const starSystem = stationModel.starSystem;
     if (!(starSystem instanceof SeededStarSystemModel)) {