diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7d15eb8..5e5f0eaf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ Nedenfor ses dato for release og beskrivelse af opgaver som er implementeret.
 
 * Tilføjede mulighed for csv eksport af alle formular konfigurationer.
 * Opdaterede docker-compose node setup.
+* Sikrede at `webform_revision` på indsendelser altid er `NULL`.
 
 ## [2.7.14] 2024-07-02
 
diff --git a/composer.json b/composer.json
index 240f86d0..8e1c234a 100644
--- a/composer.json
+++ b/composer.json
@@ -141,7 +141,8 @@
             "drupal/config_entity_revisions":  {
                 "Add check to see if entity revision actually exists(https://www.drupal.org/project/config_entity_revisions/issues/3277467)": "https://www.drupal.org/files/issues/2022-04-27/add-check-to-see-if-entity-revision-actually-exists-3277467-3.patch",
                 "https://www.drupal.org/project/config_entity_revisions/issues/3260602": "https://www.drupal.org/files/issues/2022-03-15/content_entity_revisions-3260602-07.patch",
-                "webform_revisions_install called twice during site:install --existing-config": "patches/drupal/config_entity_revisions/webform_revisions.install.patch"
+                "webform_revisions_install called twice during site:install --existing-config": "patches/drupal/config_entity_revisions/webform_revisions.install.patch",
+                "Always set webform_revision to NULL on webform submissions": "patches/drupal/config_entity_revisions/WebformRevisionController.patch"
             },
             "drupal/permissions_by_term": {
                 "Change check for node form": "patches/drupal/permissions_by_term/changeNodeCheck.patch"
diff --git a/composer.lock b/composer.lock
index 0e912318..35685d09 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "07708cd52b7439c020935b1474268e09",
+    "content-hash": "4eafaaacc35211f07fe011b47db6388c",
     "packages": [
         {
             "name": "asm89/stack-cors",
diff --git a/patches/drupal/config_entity_revisions/WebformRevisionController.patch b/patches/drupal/config_entity_revisions/WebformRevisionController.patch
new file mode 100644
index 00000000..eefe4cc8
--- /dev/null
+++ b/patches/drupal/config_entity_revisions/WebformRevisionController.patch
@@ -0,0 +1,12 @@
+diff --git a/modules/webform_revisions/src/Controller/WebformRevisionsController.php b/modules/webform_revisions/src/Controller/WebformRevisionsController.php
+index f7dc1ef..273716d 100644
+--- a/modules/webform_revisions/src/Controller/WebformRevisionsController.php
++++ b/modules/webform_revisions/src/Controller/WebformRevisionsController.php
+@@ -90,6 +90,6 @@ class WebformRevisionsController extends ConfigEntityRevisionsControllerBase imp
+     /* @var $webform \Drupal\webform_revisions\Entity\WebformRevisions */
+     $webform = $entity->getWebform();
+ 
+-    $entity->set('webform_revision', $webform->getRevisionID());
++    $entity->set('webform_revision', NULL);
+   }
+ }
diff --git a/web/modules/custom/os2forms_selvbetjening/os2forms_selvbetjening.install b/web/modules/custom/os2forms_selvbetjening/os2forms_selvbetjening.install
new file mode 100644
index 00000000..e0d237c0
--- /dev/null
+++ b/web/modules/custom/os2forms_selvbetjening/os2forms_selvbetjening.install
@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * @file
+ * Install file for OS2Forms Selvbetjening module.
+ */
+
+use Drupal\os2forms_selvbetjening\Helper\InstallHelper;
+
+/**
+ * Implements hook_update_N().
+ *
+ * Set webform_revision to NULL on all existing submissions.
+ *
+ * This is done to avoid various issues we have encountered with
+ * webform revisions e.g. stray submissions and repeated identical joins
+ * during load of submissions.
+ * Future submissions is handled by a patch ensuring it is always set to NULL.
+ *
+ * @see patches/drupal/config_entity_revisions/WebformRevisionController.patch
+ */
+function os2forms_selvbetjening_update_9501() {
+  Drupal::service(InstallHelper::class)->nullifyExistingWebformSubmissionRevisions();
+}
diff --git a/web/modules/custom/os2forms_selvbetjening/os2forms_selvbetjening.services.yml b/web/modules/custom/os2forms_selvbetjening/os2forms_selvbetjening.services.yml
index caebc046..94b811b2 100644
--- a/web/modules/custom/os2forms_selvbetjening/os2forms_selvbetjening.services.yml
+++ b/web/modules/custom/os2forms_selvbetjening/os2forms_selvbetjening.services.yml
@@ -18,3 +18,8 @@ services:
       - '@router.admin_context'
     tags:
       - { name: 'event_subscriber' }
+
+  Drupal\os2forms_selvbetjening\Helper\InstallHelper:
+    arguments:
+      - '@module_handler'
+      - '@database'
diff --git a/web/modules/custom/os2forms_selvbetjening/src/Helper/InstallHelper.php b/web/modules/custom/os2forms_selvbetjening/src/Helper/InstallHelper.php
new file mode 100644
index 00000000..78bdf079
--- /dev/null
+++ b/web/modules/custom/os2forms_selvbetjening/src/Helper/InstallHelper.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace Drupal\os2forms_selvbetjening\Helper;
+
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\os2forms_selvbetjening\Exception\SelvbetjeningException;
+
+/**
+ * Helper for install.
+ */
+class InstallHelper {
+
+  /**
+   * Constructor.
+   *
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $moduleInstaller
+   *   Module handler.
+   * @param \Drupal\Core\Database\Connection $connection
+   *   The database connection.
+   */
+  public function __construct(
+    private readonly ModuleHandlerInterface $moduleInstaller,
+    private readonly Connection $connection
+  ) {
+  }
+
+  /**
+   * Nullify webform revision on existing webform submissions.
+   */
+  public function nullifyExistingWebformSubmissionRevisions() {
+    if (!$this->moduleInstaller->moduleExists('webform_revisions')) {
+      return;
+    }
+
+    // Loop through all submissions setting webform_revision to null.
+    try {
+      $this->connection->update('webform_submission')
+        ->fields([
+          'webform_revision' => NULL,
+        ])
+        ->execute();
+    }
+    catch (\Exception $e) {
+      throw new SelvbetjeningException('Unable to update webform revisions on submissions.', $e->getCode(), $e);
+    }
+  }
+
+}