diff --git a/micro_manager/config.py b/micro_manager/config.py
index 7b82842..568ae5b 100644
--- a/micro_manager/config.py
+++ b/micro_manager/config.py
@@ -184,7 +184,7 @@ def read_json_micro_manager(self):
             else:
                 raise Exception("Adaptivity type can be either local or global.")
 
-            if data["simulation_params"]["adaptivity_settings"]["lazy_init"] == "True":
+            if self._data["simulation_params"]["adaptivity_settings"]["lazy_init"] == "True":
                 self._micro_sims_lazy_init = True
 
             exchange_data = {**self._read_data_names, **self._write_data_names}