From 8965838265f67f962ab29e9ca83c40127dff6c25 Mon Sep 17 00:00:00 2001
From: Ian Chen <ichen@openrobotics.org>
Date: Tue, 15 Oct 2024 22:19:22 +0000
Subject: [PATCH] fix multicopter crash

Signed-off-by: Ian Chen <ichen@openrobotics.org>
---
 src/systems/multicopter_motor_model/MulticopterMotorModel.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/systems/multicopter_motor_model/MulticopterMotorModel.cc b/src/systems/multicopter_motor_model/MulticopterMotorModel.cc
index 5a711272bd..02fa87b774 100644
--- a/src/systems/multicopter_motor_model/MulticopterMotorModel.cc
+++ b/src/systems/multicopter_motor_model/MulticopterMotorModel.cc
@@ -411,7 +411,8 @@ void MulticopterMotorModel::PreUpdate(const UpdateInfo &_info,
 
     const auto parentLinkName = _ecm.Component<components::ParentLinkName>(
         this->dataPtr->jointEntity);
-    this->dataPtr->parentLinkName = parentLinkName->Data();
+    if (parentLinkName)
+      this->dataPtr->parentLinkName = parentLinkName->Data();
   }
 
   if (this->dataPtr->linkEntity == kNullEntity)