diff --git a/apps/backend/src/app/modules/maps/maps.service.ts b/apps/backend/src/app/modules/maps/maps.service.ts
index 141e98188..fabaf27c1 100644
--- a/apps/backend/src/app/modules/maps/maps.service.ts
+++ b/apps/backend/src/app/modules/maps/maps.service.ts
@@ -552,6 +552,15 @@ export class MapsService {
     const hasVmf = vmfFiles?.length > 0;
     const bspHash = FileStoreService.getHashForBuffer(bspFile.buffer);
 
+    // Check for duplicate map hash
+    const existingMap = await this.db.mMap.exists({
+      where: { versions: { some: { bspHash } } }
+    });
+
+    if (existingMap) {
+      throw new ConflictException('Map with this file hash already exists');
+    }
+
     let map: Awaited<ReturnType<typeof this.createMapDbEntry>>;
 
     const tasks: Promise<any>[] = [
@@ -661,6 +670,15 @@ export class MapsService {
     const hasVmf = vmfFiles?.length > 0;
     const bspHash = FileStoreService.getHashForBuffer(bspFile.buffer);
 
+    // Check for duplicate map hash
+    const existingMap = await this.db.mMap.exists({
+      where: { versions: { some: { bspHash } } }
+    });
+
+    if (existingMap) {
+      throw new ConflictException('Map with this file hash already exists');
+    }
+
     let zonesStr: string;
     let zones: MapZones;
     if (dto.zones) {