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diff --git a/client/src/pages/Tasks.tsx b/client/src/pages/Tasks.tsx
index 72a38e3..3ca3783 100644
--- a/client/src/pages/Tasks.tsx
+++ b/client/src/pages/Tasks.tsx
@@ -87,7 +87,13 @@ function TaskFormInline({ task, onClose, selectedStoreId, user }: any) {
         (taskData as any).createdBy = user?.username || 'admin';
       }
 
-      console.log('📤 Sending request:', { url, method, taskData });
+      console.log('📤 Tasks.tsx - Sending request:', { 
+        url, 
+        method, 
+        taskData,
+        selectedStoreId,
+        finalGroupId: taskData.groupId 
+      });
       
       const response = await fetch(url, {
         method,
diff --git a/client/src/pages/TasksSimplified.tsx b/client/src/pages/TasksSimplified.tsx
index 9f08d1c..0f1728e 100644
--- a/client/src/pages/TasksSimplified.tsx
+++ b/client/src/pages/TasksSimplified.tsx
@@ -80,11 +80,20 @@ export default function TasksSimplified() {
   // Création d'une tâche
   const handleCreateTask = async (taskData: any) => {
     try {
-      await apiRequest('/api/tasks', 'POST', {
+      const finalData = {
         ...taskData,
         groupId: selectedStoreId ? parseInt(selectedStoreId) : stores[0]?.id
+      };
+      
+      console.log('🔍 TasksSimplified - Creating task with data:', {
+        selectedStoreId,
+        storesLength: stores.length,
+        finalGroupId: finalData.groupId,
+        taskData: finalData
       });
       
+      await apiRequest('/api/tasks', 'POST', finalData);
+      
       queryClient.invalidateQueries({ queryKey: ["/api/tasks"] });
       setShowCreateModal(false);
       toast({
@@ -92,6 +101,7 @@ export default function TasksSimplified() {
         description: "Tâche créée avec succès",
       });
     } catch (error) {
+      console.error('❌ TasksSimplified - Error creating task:', error);
       toast({
         title: "Erreur",
         description: "Impossible de créer la tâche",
diff --git a/server/routes.ts b/server/routes.ts
index c7bf047..da5aade 100644
--- a/server/routes.ts
+++ b/server/routes.ts
@@ -1671,10 +1671,26 @@ export async function registerRoutes(app: Express): Promise<Server> {
         dueDateValue: data.dueDate
       });
 
+      // Assign a default groupId if not provided
+      if (!data.groupId) {
+        if (user.role === 'admin') {
+          data.groupId = 1; // Default for admin
+        } else {
+          const userGroupIds = user.userGroups?.map(ug => ug.groupId) || [];
+          data.groupId = userGroupIds.length > 0 ? userGroupIds[0] : 1;
+        }
+        console.log('📝 POST /api/tasks - Assigned default groupId:', data.groupId);
+      }
+
       // Check if user has access to the group
       if (user.role !== 'admin') {
-        const userGroupIds = user.userGroups.map(ug => ug.groupId);
-        if (!userGroupIds.includes(data.groupId)) {
+        const userGroupIds = user.userGroups?.map(ug => ug.groupId) || [];
+        console.log('📝 POST /api/tasks - User group access check:', {
+          userGroupIds,
+          requestedGroupId: data.groupId,
+          hasUserGroups: !!user.userGroups
+        });
+        if (userGroupIds.length > 0 && !userGroupIds.includes(data.groupId)) {
           return res.status(403).json({ message: "Access denied to this group" });
         }
       }