diff --git a/src/sora.cpp b/src/sora.cpp
index d798c53..0d29cb8 100644
--- a/src/sora.cpp
+++ b/src/sora.cpp
@@ -269,7 +269,9 @@ Sora::ConvertForwardingFilter(const nb::handle value) {
 
   try {
     auto object = forwarding_filter_value.as_object();
-    filter.action = std::string(object["action"].as_string());
+    if (!object["action"].is_null()) {
+      filter.action = std::string(object["action"].as_string());
+    }
     for (auto or_rule : object["rules"].as_array()) {
       std::vector<sora::SoraSignalingConfig::ForwardingFilter::Rule> rules;
       for (auto and_rule_value : or_rule.as_array()) {