diff --git a/userspace/falco/app/actions/process_events.cpp b/userspace/falco/app/actions/process_events.cpp
index f2412edd579..ea89add46f9 100644
--- a/userspace/falco/app/actions/process_events.cpp
+++ b/userspace/falco/app/actions/process_events.cpp
@@ -265,10 +265,13 @@ static falco::app::run_result do_inspect(
 			if (source_engine_idx == sinsp_no_event_source_idx)
 			{
 				std::string msg = "Unknown event source for inspector's event";
-				if (ev->get_type() == PPME_PLUGINEVENT_E)
+				if (ev->get_type() == PPME_PLUGINEVENT_E || ev->get_type() == PPME_ASYNCEVENT_E)
 				{
-					auto pluginID = *(int32_t *)ev->get_param(0)->m_val;
-					msg += " (plugin ID: " + std::to_string(pluginID) + ")";
+					auto pluginID = *(uint32_t *)ev->get_param(0)->m_val;
+					if (pluginID != 0)
+					{
+						msg += " (plugin ID: " + std::to_string(pluginID) + ")";
+					}
 				}
 				return run_result::fatal(msg);
 			}