Avoid iterator invalidation issues in ActionList::Run.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/cull.cpp b/src/cull.cpp
index 4957773e2..b2cf536a5 100644
--- a/src/cull.cpp
+++ b/src/cull.cpp
@@ -127,7 +127,9 @@ void CullList::Apply()
 
 void ActionList::Run()
 {
-	for (auto* action : list)
-		action->Call();
+	// IMPORTANT: we can't use a range-based for loop here as adding to the list
+	// may invalidate the list iterators.
+	for (size_t idx = 0; idx < list.size(); ++idx)
+		list[idx]->Call();
 	list.clear();
 }