From f07ed76097f4b0cf274fc936525e29f350ab9f9d Mon Sep 17 00:00:00 2001
From: Brandon <ripleyb@users.noreply.github.com>
Date: Wed, 24 Jan 2024 10:05:08 -0800
Subject: [PATCH] Fixing workbench init context implementation

Init context add timer could cause null pointer exception if model instances didn't exist.
---
 .../digitaltwin/development/TwinExecutionEngine.java          | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Development/src/main/java/com/scaleoutsoftware/digitaltwin/development/TwinExecutionEngine.java b/Development/src/main/java/com/scaleoutsoftware/digitaltwin/development/TwinExecutionEngine.java
index 385049a..fc55d30 100644
--- a/Development/src/main/java/com/scaleoutsoftware/digitaltwin/development/TwinExecutionEngine.java
+++ b/Development/src/main/java/com/scaleoutsoftware/digitaltwin/development/TwinExecutionEngine.java
@@ -75,8 +75,10 @@ void addDigitalTwin(String digitalTwinModelName, MessageProcessor digitalTwinMes
     }
 
     void addTimer(String modelName, String id, String timerName, TimerType type, Duration interval, TimerHandler handler) {
-
         ConcurrentHashMap<String,TwinProxy> modelInstances = _modelInstances.get(modelName);
+        if(modelInstances == null) {
+            modelInstances = new ConcurrentHashMap<>();
+        }
         TwinProxy proxy = modelInstances.get(id);
         SimulationScheduler scheduler = _simulationSchedulers.get(modelName);
         if (scheduler != null) {