From d18964d5aa968cea0742c4bb0dad99a3f2e37f3f Mon Sep 17 00:00:00 2001
From: Matt Borland <matt@mattborland.com>
Date: Thu, 16 Nov 2023 09:38:11 +0100
Subject: [PATCH] Check update of xterm for denom of 0

---
 include/boost/math/distributions/non_central_beta.hpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/boost/math/distributions/non_central_beta.hpp b/include/boost/math/distributions/non_central_beta.hpp
index 9266c9e57..944f1dc24 100644
--- a/include/boost/math/distributions/non_central_beta.hpp
+++ b/include/boost/math/distributions/non_central_beta.hpp
@@ -212,7 +212,10 @@ namespace boost
                }
                pois *= i / l2;
                beta -= xterm;
-               xterm *= (a + i - 1) / (x * (a + b + i - 2));
+               if (a + b + i - 2 != 0)
+               {
+                   xterm *= (a + i - 1) / (x * (a + b + i - 2));
+               }
             }
             return sum;
          }