diff --git a/project/src/controllers/GameController.ts b/project/src/controllers/GameController.ts
index 7a4cdf41..67fea823 100644
--- a/project/src/controllers/GameController.ts
+++ b/project/src/controllers/GameController.ts
@@ -2,6 +2,7 @@ import { ApplicationContext } from "@spt/context/ApplicationContext";
 import { ContextVariableType } from "@spt/context/ContextVariableType";
 import { HideoutHelper } from "@spt/helpers/HideoutHelper";
 import { HttpServerHelper } from "@spt/helpers/HttpServerHelper";
+import { InventoryHelper } from "@spt/helpers/InventoryHelper";
 import { ProfileHelper } from "@spt/helpers/ProfileHelper";
 import { PreSptModLoader } from "@spt/loaders/PreSptModLoader";
 import { IEmptyRequestData } from "@spt/models/eft/common/IEmptyRequestData";
@@ -68,6 +69,7 @@ export class GameController {
         @inject("HashUtil") protected hashUtil: HashUtil,
         @inject("PreSptModLoader") protected preSptModLoader: PreSptModLoader,
         @inject("HttpServerHelper") protected httpServerHelper: HttpServerHelper,
+        @inject("InventoryHelper") protected inventoryHelper: InventoryHelper,
         @inject("RandomUtil") protected randomUtil: RandomUtil,
         @inject("HideoutHelper") protected hideoutHelper: HideoutHelper,
         @inject("ProfileHelper") protected profileHelper: ProfileHelper,
@@ -165,6 +167,9 @@ export class GameController {
 
             //3.9 migrations
             if (fullProfile.spt.version.includes("3.9.") && !fullProfile.spt.migrations["39x"]) {
+                // Check every item has a valid mongoid
+                this.inventoryHelper.validateInventoryUsesMonogoIds(fullProfile.characters.pmc.Inventory.items);
+
                 this.migrate39xProfile(fullProfile);
 
                 // Flag as migrated
diff --git a/project/src/helpers/InventoryHelper.ts b/project/src/helpers/InventoryHelper.ts
index 571a4f85..985f96a7 100644
--- a/project/src/helpers/InventoryHelper.ts
+++ b/project/src/helpers/InventoryHelper.ts
@@ -1138,6 +1138,16 @@ export class InventoryHelper {
         // Start recursive check
         return isParentInStash(itemToCheck._id);
     }
+
+    public validateInventoryUsesMonogoIds(itemsToValidate: Item[]) {
+        for (const item of itemsToValidate) {
+            if (!/^[a-fA-F0-9]{24}$/.test(item._id)) {
+                throw new Error(
+                    `This profile is not compatible with 3.10.0, It contains an item with the ID: ${item._id} that is not compatible. Loading of SPT has been halted, use another profile or create a new one.`,
+                );
+            }
+        }
+    }
 }
 
 namespace InventoryHelper {