diff --git a/daemon/app_supervisor.c b/daemon/app_supervisor.c
index 2b2edfd7..0aab16cc 100644
--- a/daemon/app_supervisor.c
+++ b/daemon/app_supervisor.c
@@ -436,6 +436,25 @@ const char * ladish_app_supervisor_get_name(ladish_app_supervisor_handle supervi
   return supervisor_ptr->name;
 }
 
+unsigned int ladish_app_supervisor_get_running_app_count(ladish_app_supervisor_handle supervisor_handle)
+{
+  struct list_head * node_ptr;
+  struct ladish_app * app_ptr;
+  unsigned int counter;
+
+  counter = 0;
+  list_for_each(node_ptr, &supervisor_ptr->applist)
+  {
+    app_ptr = list_entry(node_ptr, struct ladish_app, siblings);
+    if (app_ptr->pid != 0)
+    {
+      counter++;
+    }
+  }
+
+  return counter;
+}
+
 #undef supervisor_ptr
 #define supervisor_ptr ((struct ladish_app_supervisor *)call_ptr->iface_context)
 
diff --git a/daemon/app_supervisor.h b/daemon/app_supervisor.h
index fe8c91e5..7ea673e3 100644
--- a/daemon/app_supervisor.h
+++ b/daemon/app_supervisor.h
@@ -81,6 +81,7 @@ ladish_app_supervisor_search_app(
   pid_t pid);
 
 const char * ladish_app_supervisor_get_name(ladish_app_supervisor_handle supervisor_handle);
+unsigned int ladish_app_supervisor_get_running_app_count(ladish_app_supervisor_handle supervisor_handle);
 
 extern const struct dbus_interface_descriptor g_iface_app_supervisor;
 
diff --git a/daemon/studio.c b/daemon/studio.c
index 27344ef9..ce4bc240 100644
--- a/daemon/studio.c
+++ b/daemon/studio.c
@@ -1129,6 +1129,7 @@ static void ladish_studio_delete_room(struct dbus_method_call * call_ptr)
   ladish_room_handle room;
   uuid_t room_uuid;
   ladish_client_handle room_client;
+  unsigned int running_app_count;
 
   dbus_error_init(&g_dbus_error);
 
@@ -1146,6 +1147,16 @@ static void ladish_studio_delete_room(struct dbus_method_call * call_ptr)
     room = ladish_room_from_list_node(node_ptr);
     if (strcmp(ladish_room_get_name(room), name) == 0)
     {
+      running_app_count = ladish_app_supervisor_get_running_app_count(ladish_room_get_app_supervisor(room));
+      if (running_app_count != 0)
+      {
+        /* TODO: instead of rejecting the room deletion, use the command queue and wait for room apps to stop.
+           This requires proper "project in room" implementation because project needs to be
+           unloaded anyway and unloading project should initiate and wait apps termination */
+        lash_dbus_error(call_ptr, LASH_DBUS_ERROR_INVALID_ARGS, "Cannot delete room \"%s\" because it has %u app(s) running", name, running_app_count);
+        return;
+      }
+
       list_del(node_ptr);
       emit_room_disappeared(room);