diff --git a/pycromanager/_version.py b/pycromanager/_version.py
index 934e5e80..02e0e537 100644
--- a/pycromanager/_version.py
+++ b/pycromanager/_version.py
@@ -1,2 +1,2 @@
-version_info = (1, 0, 1)
+version_info = (1, 0, 2)
 __version__ = ".".join(map(str, version_info))
diff --git a/pycromanager/acquisition/acq_eng_py/internal/engine.py b/pycromanager/acquisition/acq_eng_py/internal/engine.py
index 6018d783..1a4a234a 100644
--- a/pycromanager/acquisition/acq_eng_py/internal/engine.py
+++ b/pycromanager/acquisition/acq_eng_py/internal/engine.py
@@ -37,6 +37,9 @@ def get_core():
 
     @staticmethod
     def get_instance():
+        if not hasattr(Engine, 'singleton'):
+            return None
+
         return Engine.singleton
 
     def finish_acquisition(self, acq):
diff --git a/pycromanager/headless.py b/pycromanager/headless.py
index e038ca32..ce3846f9 100644
--- a/pycromanager/headless.py
+++ b/pycromanager/headless.py
@@ -58,5 +58,6 @@ def start_headless(
 
 def stop_headless(debug=False):
     terminate_core_instances(debug=debug)
-    Engine.get_instance().shutdown()
+    if Engine.get_instance():
+        Engine.get_instance().shutdown()