From 1c67b948b6745e1aa6deeeea8473740aeea0e315 Mon Sep 17 00:00:00 2001
From: Mikhail Khachayants <mkhachaiants@gmail.com>
Date: Sun, 20 Oct 2024 13:47:54 +0300
Subject: [PATCH] Fix stack overflow for unresolved references

---
 include/valijson/schema_parser.hpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/valijson/schema_parser.hpp b/include/valijson/schema_parser.hpp
index fef97b3..7359b77 100644
--- a/include/valijson/schema_parser.hpp
+++ b/include/valijson/schema_parser.hpp
@@ -1040,13 +1040,14 @@ private:
             resolveThenPopulateSchema(rootSchema, newRootNode, referencedAdapter, subschema, {}, actualJsonPointer,
                     fetchDoc, parentSchema, ownName, docCache, schemaCache);
 
-        } else {
+        } else if (!actualJsonPointer.empty()) {
             const AdapterType &referencedAdapter =
                     internal::json_pointer::resolveJsonPointer(rootNode, actualJsonPointer);
 
-            // TODO: Need to detect degenerate circular references
             resolveThenPopulateSchema(rootSchema, rootNode, referencedAdapter, subschema, {}, actualJsonPointer,
                     fetchDoc, parentSchema, ownName, docCache, schemaCache);
+        } else {
+            throwRuntimeError("Cannot resolve reference \"" + jsonRef + "\".");
         }
     }