From 4be2bd16243ae620d018fadd66516bea5529a450 Mon Sep 17 00:00:00 2001
From: SiboVG <sibo.vangool@hotmail.com>
Date: Fri, 7 Apr 2023 14:49:58 +0200
Subject: [PATCH] [#2180] Recompute layers if null

---
 .../models/atmosphere/InterpolatingAtmosphericModel.java      | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/core/src/net/sf/openrocket/models/atmosphere/InterpolatingAtmosphericModel.java b/core/src/net/sf/openrocket/models/atmosphere/InterpolatingAtmosphericModel.java
index 780adc300..3b34fb9aa 100644
--- a/core/src/net/sf/openrocket/models/atmosphere/InterpolatingAtmosphericModel.java
+++ b/core/src/net/sf/openrocket/models/atmosphere/InterpolatingAtmosphericModel.java
@@ -36,6 +36,10 @@ public abstract class InterpolatingAtmosphericModel implements AtmosphericModel
 		int n = (int) (altitude / DELTA);
 		double d = (altitude - n * DELTA) / DELTA;
 		AtmosphericConditions c = new AtmosphericConditions();
+		// TODO: LOW: levels[n] returned null in some cases, see GitHub issue #2180 for more information
+		if (levels[n] == null) {
+			computeLayers();
+		}
 		c.setTemperature(levels[n].getTemperature() * (1 - d) + levels[n + 1].getTemperature() * d);
 		c.setPressure(levels[n].getPressure() * (1 - d) + levels[n + 1].getPressure() * d);