diff --git a/rpcs3/Emu/Cell/lv2/sys_event.cpp b/rpcs3/Emu/Cell/lv2/sys_event.cpp
index afc7fda33d..a3269e202d 100644
--- a/rpcs3/Emu/Cell/lv2/sys_event.cpp
+++ b/rpcs3/Emu/Cell/lv2/sys_event.cpp
@@ -420,6 +420,11 @@ error_code sys_event_port_connect_ipc(ppu_thread& ppu, u32 eport_id, u64 ipc_key
 
 	sys_event.warning("sys_event_port_connect_ipc(eport_id=0x%x, ipc_key=0x%x)", eport_id, ipc_key);
 
+	if (ipc_key == 0)
+	{
+		return CELL_EINVAL;
+	}
+
 	auto queue = lv2_event_queue::find(ipc_key);
 
 	std::lock_guard lock(id_manager::g_mutex);
diff --git a/rpcs3/Emu/Cell/lv2/sys_sync.h b/rpcs3/Emu/Cell/lv2/sys_sync.h
index 53c47b08f4..b9d1b32335 100644
--- a/rpcs3/Emu/Cell/lv2/sys_sync.h
+++ b/rpcs3/Emu/Cell/lv2/sys_sync.h
@@ -162,6 +162,11 @@ public:
 		{
 		case SYS_SYNC_PROCESS_SHARED:
 		{
+			if (ipc_key == 0)
+			{
+				return CELL_EINVAL;
+			}
+
 			switch (flags)
 			{
 			case SYS_SYNC_NEWLY_CREATED: