From 8e838c1424faaf158a09ad35b0369e68f1efc4a8 Mon Sep 17 00:00:00 2001
From: Sam Cameron <samuel.j.m.cameron@gmail.com>
Date: Sat, 2 Apr 2022 12:55:51 +0100
Subject: [PATCH] Bug fix in vtk dump.

---
 src/VTK/dump_vtk.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/VTK/dump_vtk.cpp b/src/VTK/dump_vtk.cpp
index a7aabe3f51..d8ae9aefe2 100644
--- a/src/VTK/dump_vtk.cpp
+++ b/src/VTK/dump_vtk.cpp
@@ -1903,7 +1903,12 @@ void DumpVTK::identify_vectors()
        name.count(vector3_starts[v3s]+2) )
     {
       std::string vectorName = name[vector3_starts[v3s]];
-      vectorName.erase(vectorName.find_first_of('x'));
+      std::string::size_type erase_start = vectorName.find_first_of('x');
+      if (erase_start == 0) {
+	vectorName.erase(0,1);
+      } else {
+	vectorName.erase(erase_start);
+      }
       name[vector3_starts[v3s]] = vectorName;
       vector_set.insert(vector3_starts[v3s]);
     }