From f5e84b6e37f9c78dc8ea6e24e1186f9146b4aa3b Mon Sep 17 00:00:00 2001
From: Nat Quayle Nelson <natquaylenelson@gmail.com>
Date: Sat, 17 May 2025 10:26:15 -0500
Subject: [PATCH] dialogxml catch nonexistent anchor at end of relative chain

---
 src/dialogxml/dialogs/dialog.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/dialogxml/dialogs/dialog.cpp b/src/dialogxml/dialogs/dialog.cpp
index 97bd174f..917b179b 100644
--- a/src/dialogxml/dialogs/dialog.cpp
+++ b/src/dialogxml/dialogs/dialog.cpp
@@ -283,8 +283,12 @@ void cDialog::loadFromFile(const DialogDefn& file){
 					// Make sure it's not a loop!
 					std::vector<std::string> refs{ctrl.anchor};
 					while(!anchor->anchor.empty()) {
+						cControl* next_anchor = findControl(anchor->anchor);
+						if(next_anchor == nullptr){
+							throw xBadVal(ctrlTypeName(anchor->getType()), "anchor", anchor->anchor, 0, 0, fname);
+						}
 						refs.push_back(anchor->anchor);
-						anchor = findControl(anchor->anchor);
+						anchor = next_anchor;
 						if(std::find(refs.begin(), refs.end(), anchor->anchor) != refs.end()) {
 							throw xBadVal(ctrlTypeName(ctrl.getType()), "anchor", "<circular dependency>", 0, 0, fname);
 						}