diff --git a/backend/src/Designer/Models/LayoutSets.cs b/backend/src/Designer/Models/LayoutSets.cs
index 1d19842bbc8..9efb83fba5a 100644
--- a/backend/src/Designer/Models/LayoutSets.cs
+++ b/backend/src/Designer/Models/LayoutSets.cs
@@ -23,10 +23,12 @@ public class LayoutSetConfig
     public string Id { get; set; }
 
     [JsonPropertyName("dataType")]
-    [CanBeNull] public string DataType { get; set; }
+    [CanBeNull]
+    public string DataType { get; set; }
 
     [JsonPropertyName("tasks")]
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    [CanBeNull]
     public List<string> Tasks { get; set; }
 
     [JsonPropertyName("type")]
diff --git a/backend/src/Designer/Services/Implementation/AppDevelopmentService.cs b/backend/src/Designer/Services/Implementation/AppDevelopmentService.cs
index 9f59ec42bdf..34177cd0c6d 100644
--- a/backend/src/Designer/Services/Implementation/AppDevelopmentService.cs
+++ b/backend/src/Designer/Services/Implementation/AppDevelopmentService.cs
@@ -305,7 +305,7 @@ public async Task<LayoutSets> AddLayoutSet(AltinnRepoEditingContext altinnRepoEd
             {
                 throw new NonUniqueLayoutSetIdException($"Layout set name, {newLayoutSet.Id}, already exists.");
             }
-            if (newLayoutSet.Tasks != null && layoutSets.Sets.Exists(set => set.Tasks[0] == newLayoutSet.Tasks[0]))
+            if (newLayoutSet.Tasks != null && layoutSets.Sets.Exists(set => set.Tasks?[0] == newLayoutSet.Tasks[0]))
             {
                 throw new NonUniqueTaskForLayoutSetException($"Layout set with task, {newLayoutSet.Tasks[0]}, already exists.");
             }
diff --git a/frontend/app-development/features/processEditor/bpmnHandlerUtils/bpmnHandlerUtils.ts b/frontend/app-development/features/processEditor/bpmnHandlerUtils/bpmnHandlerUtils.ts
index 4ea9be4742c..708927a83f4 100644
--- a/frontend/app-development/features/processEditor/bpmnHandlerUtils/bpmnHandlerUtils.ts
+++ b/frontend/app-development/features/processEditor/bpmnHandlerUtils/bpmnHandlerUtils.ts
@@ -1,6 +1,6 @@
 import type { LayoutSets } from 'app-shared/types/api/LayoutSetsResponse';
 
 export const getLayoutSetIdFromTaskId = (elementId: string, layoutSets: LayoutSets) => {
-  const layoutSet = layoutSets.sets.find((set) => set.tasks[0] === elementId);
+  const layoutSet = layoutSets.sets.find((set) => set.tasks && set.tasks[0] === elementId);
   return layoutSet?.id;
 };
diff --git a/frontend/packages/process-editor/src/components/ConfigPanel/ConfigContent/ConfigContent.tsx b/frontend/packages/process-editor/src/components/ConfigPanel/ConfigContent/ConfigContent.tsx
index 7f9c51e7b89..b99cb379853 100644
--- a/frontend/packages/process-editor/src/components/ConfigPanel/ConfigContent/ConfigContent.tsx
+++ b/frontend/packages/process-editor/src/components/ConfigPanel/ConfigContent/ConfigContent.tsx
@@ -20,11 +20,13 @@ export const ConfigContent = (): React.ReactElement => {
   const { t } = useTranslation();
   const { bpmnDetails } = useBpmnContext();
   const { layoutSets, availableDataModelIds } = useBpmnApiContext();
-  const layoutSet = layoutSets?.sets.find((set) => set.tasks.includes(bpmnDetails.id));
+  const layoutSet = layoutSets?.sets.find((set) => set.tasks?.includes(bpmnDetails.id));
   const existingDataTypeForTask = layoutSet?.dataType;
   const isSigningTask = bpmnDetails.taskType === 'signing';
 
-  const taskHasConnectedLayoutSet = layoutSets?.sets?.some((set) => set.tasks[0] == bpmnDetails.id);
+  const taskHasConnectedLayoutSet = layoutSets?.sets?.some(
+    (set) => set.tasks && set.tasks[0] == bpmnDetails.id,
+  );
   const { shouldDisplayAction } = useStudioRecommendedNextActionContext();
 
   const studioModeler = new StudioModeler();