From a7bf9a0d0f4a86ba39d50c97cdc6dd5cafa2f1fb Mon Sep 17 00:00:00 2001
From: kmilner <kmilner@igskci164lw0100.gs.doi.net>
Date: Sun, 23 Jun 2024 15:58:17 -0700
Subject: [PATCH] fixed bug in cube association build logic

---
 .../rupForecastImpl/nshm23/NSHM23_InvConfigFactory.java        | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/opensha/sha/earthquake/rupForecastImpl/nshm23/NSHM23_InvConfigFactory.java b/src/main/java/org/opensha/sha/earthquake/rupForecastImpl/nshm23/NSHM23_InvConfigFactory.java
index 1a0eb67f8..2f733e807 100644
--- a/src/main/java/org/opensha/sha/earthquake/rupForecastImpl/nshm23/NSHM23_InvConfigFactory.java
+++ b/src/main/java/org/opensha/sha/earthquake/rupForecastImpl/nshm23/NSHM23_InvConfigFactory.java
@@ -1128,9 +1128,10 @@ private static void doPreGridBuildHook(FaultSystemSolution sol, LogicTreeBranch<
 				cubeAssociations = null; // force a rebuild
 			}
 			// build cube associations
-			if (cubeAssociations != null)
+			if (cubeAssociations == null)
 				cubeAssociations = buildFaultCubeAssociations(rupSet, seisRegions);
 		}
+		Preconditions.checkNotNull(cubeAssociations, "Cube associations is null");
 		// add to the rupture set
 		if (addCubeAssoc)
 			rupSet.addModule(cubeAssociations);