diff --git a/backend/renders/renders.go b/backend/renders/renders.go
index 6e11699..5b2ec81 100644
--- a/backend/renders/renders.go
+++ b/backend/renders/renders.go
@@ -381,7 +381,16 @@ func AdminConversationThread(db *gorm.DB) http.HandlerFunc {
 		id, _ := strconv.Atoi(idStr)
 
 		var convs []models.Conversation
-		db.Where("user_id = ?", id).Order("created_at asc").Find(&convs)
+		query := db.Order("created_at asc")
+
+		if id != 0 {
+			query = query.Where("user_id = ?", id)
+		}
+
+		if err := query.Find(&convs).Error; err != nil {
+			http.Error(w, "Erreur lors du chargement des conversations", http.StatusInternalServerError)
+			return
+		}
 
 		data := map[string]interface{}{
 			"Conversations": convs,
@@ -390,6 +399,7 @@ func AdminConversationThread(db *gorm.DB) http.HandlerFunc {
 		renderPartial(w, "admin_conversations_thread", data)
 	}
 }
+
 func Dashboard(db *gorm.DB) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		val := r.Context().Value("ssoid")
diff --git a/frontend/templates/adminconversations.pages.tmpl b/frontend/templates/adminconversations.pages.tmpl
index 85f4f51..b8b8df2 100644
--- a/frontend/templates/adminconversations.pages.tmpl
+++ b/frontend/templates/adminconversations.pages.tmpl
@@ -14,7 +14,7 @@
       <select id="userSelect"
               name="user"
               onchange="location.href='/admin/user/' + this.value + '/conversations'">
-        <option value="">Tous les utilisateurs</option>
+        <option value="0">Tous les utilisateurs</option>
         {{ range .Clients }}
           <option value="{{ .ID }}" {{ if eq $.UserID (printf "%d" .ID) }}selected{{ end }}>
             {{ .Email }}