diff --git a/project/src/services/ProfileFixerService.ts b/project/src/services/ProfileFixerService.ts
index 015a0514..28205ee0 100644
--- a/project/src/services/ProfileFixerService.ts
+++ b/project/src/services/ProfileFixerService.ts
@@ -157,6 +157,7 @@ export class ProfileFixerService
         }
 
         this.fixNullTraderSalesSums(pmcProfile);
+        this.fixNullTraderNextResupply(pmcProfile);
         this.updateProfileQuestDataValues(pmcProfile);
     }
 
@@ -1430,4 +1431,20 @@ export class ProfileFixerService
             }
         }
     }
+
+    /**
+     * If someone has run a mod from pre-3.8.0, it results in an invalid `nextResupply` value
+     * Resolve this by setting the nextResupply to 0 if it's null
+     */
+    protected fixNullTraderNextResupply(pmcProfile: IPmcData): void
+    {
+        for (const [traderId, trader] of Object.entries(pmcProfile.TradersInfo))
+        {
+            if (trader && trader.nextResupply === null)
+            {
+                this.logger.warning(`trader ${traderId} has a null nextResupply value, resetting to 0`);
+                trader.nextResupply = 0;
+            }
+        }
+    }
 }
diff --git a/project/tests/services/ProfileFixerService.test.ts b/project/tests/services/ProfileFixerService.test.ts
new file mode 100644
index 00000000..bc9b6c89
--- /dev/null
+++ b/project/tests/services/ProfileFixerService.test.ts
@@ -0,0 +1,39 @@
+import { ProfileFixerService } from "@spt-aki/services/ProfileFixerService";
+import { container } from "tsyringe";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+describe("ProfileFixerService", () =>
+{
+    let profileFixerService: any; // Using "any" to access private/protected methods without type errors.
+
+    beforeEach(() =>
+    {
+        profileFixerService = container.resolve<ProfileFixerService>("ProfileFixerService");
+    });
+
+    afterEach(() =>
+    {
+        vi.restoreAllMocks();
+    });
+
+    describe("FixPmcProfileIssues", () =>
+    {
+        it("should reset nextResupply to 0 when it is null", () =>
+        {
+            const pmcProfile = { TradersInfo: { traderId: { nextResupply: null } } };
+
+            profileFixerService.fixNullTraderNextResupply(pmcProfile);
+
+            expect(pmcProfile.TradersInfo.traderId.nextResupply).toBe(0);
+        });
+
+        it("should not reset nextResupply to 0 when it is not null", () =>
+        {
+            const pmcProfile = { TradersInfo: { traderId: { nextResupply: 1234 } } };
+
+            profileFixerService.fixNullTraderNextResupply(pmcProfile);
+
+            expect(pmcProfile.TradersInfo.traderId.nextResupply).toBe(1234);
+        });
+    });
+});