diff --git a/tools/tidy/src/ASTHelperVisitors.cpp b/tools/tidy/src/ASTHelperVisitors.cpp
index 537c8e9e3..392b9c479 100644
--- a/tools/tidy/src/ASTHelperVisitors.cpp
+++ b/tools/tidy/src/ASTHelperVisitors.cpp
@@ -24,5 +24,8 @@ std::optional<std::string_view> getIdentifier(const slang::ast::Expression& expr
 
 std::optional<slang::SourceLocation> getExpressionSourceLocation(
     const slang::ast::Expression& expr) {
+    if (!expr.syntax) {
+        return std::nullopt;
+    }
     return expr.syntax->getFirstToken().location();
 }