From e4601206bede0d50cb8bc979b91d3a42ad384d2e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A9a=20Saviot?= <lea.saviot@numworks.com>
Date: Wed, 5 Feb 2020 16:09:13 +0100
Subject: [PATCH] [poincare/power] Fix getUnit -> return Undef if base has
 undef unit

---
 poincare/src/power.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/poincare/src/power.cpp b/poincare/src/power.cpp
index 6e4ae648a..2d0590f8f 100644
--- a/poincare/src/power.cpp
+++ b/poincare/src/power.cpp
@@ -925,7 +925,11 @@ Expression Power::getUnit() const {
   if (childAtIndex(0).type() == ExpressionNode::Type::Unit) {
     return clone();
   }
-  return Power::Builder(childAtIndex(0).getUnit(), childAtIndex(1).clone());
+  Expression baseUnit = childAtIndex(0).getUnit();
+  if (baseUnit.isUndefined()) {
+    return baseUnit;
+  }
+  return Power::Builder(baseUnit, childAtIndex(1).clone());
 }
 
 // Private