diff --git a/backend/src/entities/assignments/submission.entity.ts b/backend/src/entities/assignments/submission.entity.ts
index f008c8c2..fbaa2791 100644
--- a/backend/src/entities/assignments/submission.entity.ts
+++ b/backend/src/entities/assignments/submission.entity.ts
@@ -19,7 +19,7 @@ export class Submission {
     learningObjectVersion: number = 1;
 
     @PrimaryKey({ type: 'integer', autoincrement: true })
-    submissionNumber!: number;
+    submissionNumber?: number;
 
     @ManyToOne({
         entity: () => Student,
diff --git a/backend/tests/services/learning-path/database-learning-path-provider.test.ts b/backend/tests/services/learning-path/database-learning-path-provider.test.ts
index fbbf8c7f..04782df3 100644
--- a/backend/tests/services/learning-path/database-learning-path-provider.test.ts
+++ b/backend/tests/services/learning-path/database-learning-path-provider.test.ts
@@ -58,7 +58,6 @@ async function initPersonalizationTestData(): Promise<{
         learningObjectHruid: learningContent.branchingObject.hruid,
         learningObjectLanguage: learningContent.branchingObject.language,
         learningObjectVersion: learningContent.branchingObject.version,
-        submissionNumber: 0,
         submitter: studentA,
         submissionTime: new Date(),
         content: '[0]',
@@ -75,7 +74,6 @@ async function initPersonalizationTestData(): Promise<{
         learningObjectHruid: learningContent.branchingObject.hruid,
         learningObjectLanguage: learningContent.branchingObject.language,
         learningObjectVersion: learningContent.branchingObject.version,
-        submissionNumber: 1,
         submitter: studentB,
         submissionTime: new Date(),
         content: '[1]',