From f23350dac814fe04fd411c44b5a6dd1cd3d84993 Mon Sep 17 00:00:00 2001
From: Tpt <thomaspt@hotmail.fr>
Date: Tue, 14 Sep 2021 18:19:40 +0200
Subject: [PATCH] SPARQL XML results: do not panic on unknown variable

---
 lib/src/sparql/xml_results.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/src/sparql/xml_results.rs b/lib/src/sparql/xml_results.rs
index adfea61a..6d1e3091 100644
--- a/lib/src/sparql/xml_results.rs
+++ b/lib/src/sparql/xml_results.rs
@@ -542,7 +542,13 @@ impl<R: BufRead> ResultsIterator<R> {
                     State::Result => return Ok(Some(new_bindings)),
                     State::Binding => {
                         if let Some(var) = &current_var {
-                            new_bindings[self.mapping[var]] = term.take()
+                            if let Some(var) = self.mapping.get(var) {
+                                new_bindings[*var] = term.take()
+                            } else {
+                                return Err(
+                                    invalid_data_error(format!("The variable '{}' is used in a binding but not declared in the variables list",  self.reader.decode(&var).map_err(map_xml_error)?)).into()
+                                );
+                            }
                         } else {
                             return Err(
                                 invalid_data_error("No name found for <binding> tag").into()