From d212ad5dd27bde9ccc19b104ac11351081a56b75 Mon Sep 17 00:00:00 2001
From: Alexander Hulpke <hulpke@math.colostate.edu>
Date: Fri, 14 Dec 2018 12:51:14 +0100
Subject: [PATCH] Workaround for error #3055

This is a bug that arises very rarely, maybe based on random
selections. In this case restart calculations.
---
 lib/clashom.gi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/clashom.gi b/lib/clashom.gi
index 452659cb1e1..2b0efc2f565 100644
--- a/lib/clashom.gi
+++ b/lib/clashom.gi
@@ -738,6 +738,11 @@ local clT,	# classes T
 			  dsz:=DivisorsInt(scj);
 			fi;
 			while not minlen in dsz do
+                          # workaround rare problem -- try again
+                          if First(dsz,i->i>=minlen)=fail then
+                            return ConjugacyClassesSubwreath(
+                              F,M,n,autT,T,Lloc,components,embeddings,projections);
+                          fi;
 			  # minimum gcd multiple to get at least the
 			  # smallest divisor
 			  minlen:=minlen+