diff --git a/src/services/missionInventoryUpdateService.ts b/src/services/missionInventoryUpdateService.ts
index 908be883..7d8675c5 100644
--- a/src/services/missionInventoryUpdateService.ts
+++ b/src/services/missionInventoryUpdateService.ts
@@ -326,8 +326,8 @@ export const addMissionInventoryUpdates = async (
                 break;
             }
             case "PlayerSkillGains": {
-                inventory.PlayerSkills.LPP_SPACE += value.LPP_SPACE;
-                inventory.PlayerSkills.LPP_DRIFTER += value.LPP_DRIFTER;
+                inventory.PlayerSkills.LPP_SPACE += value.LPP_SPACE ?? 0;
+                inventory.PlayerSkills.LPP_DRIFTER += value.LPP_DRIFTER ?? 0;
                 break;
             }
             case "CustomMarkers": {
diff --git a/src/types/requestTypes.ts b/src/types/requestTypes.ts
index 6fdd0c09..a6b3f1c1 100644
--- a/src/types/requestTypes.ts
+++ b/src/types/requestTypes.ts
@@ -96,7 +96,7 @@ export type IMissionInventoryUpdateRequest = {
     FpsSamples: number;
     EvolutionProgress?: IEvolutionProgress[];
     FocusXpIncreases?: number[];
-    PlayerSkillGains: IPlayerSkills;
+    PlayerSkillGains: Partial<IPlayerSkills>;
     CustomMarkers?: ICustomMarkers[];
     LoreFragmentScans?: ILoreFragmentScan[];
     VoidTearParticipantsCurrWave?: {