diff --git a/src/library/module.cpp b/src/library/module.cpp
index 6505a9e24..743a89812 100644
--- a/src/library/module.cpp
+++ b/src/library/module.cpp
@@ -291,6 +291,8 @@ struct import_modules_fn {
     }
 
     void process_asynch_tasks() {
+        if (m_asynch_tasks.empty())
+            return;
         std::vector<std::unique_ptr<interruptible_thread>> extra_threads;
         std::vector<std::unique_ptr<exception>> thread_exceptions(m_num_threads - 1);
         for (unsigned i = 0; i < m_num_threads - 1; i++) {
diff --git a/tests/lua/mod4.lua b/tests/lua/mod4.lua
new file mode 100644
index 000000000..538a4709f
--- /dev/null
+++ b/tests/lua/mod4.lua
@@ -0,0 +1 @@
+local env = import_modules({})