diff --git a/src/algo_dup2.c b/src/algo_dup2.c
index 3c1b991..8a3b03f 100644
--- a/src/algo_dup2.c
+++ b/src/algo_dup2.c
@@ -56,7 +56,7 @@ int algo_dup2_on_datagram(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdin
 
   for (int i = 0; i < 2; i++) {
     // 1. A whole packet has been read, we will find someone to write it
-    to_fdinfo = g_array_index(cat->socklist, struct evt_core_fdinfo*, i);
+    to_fdinfo = cat->socklist->len > i ? g_array_index(cat->socklist, struct evt_core_fdinfo*, i) : NULL;
     if (to_fdinfo == NULL) {
       fprintf(stderr, "No fd for cat %s in udp-read.\n", cat->name);
       continue;
diff --git a/src/algo_naive.c b/src/algo_naive.c
index 64f9cce..d821a05 100644
--- a/src/algo_naive.c
+++ b/src/algo_naive.c
@@ -32,7 +32,7 @@ int algo_naive_on_datagram(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdi
 
   // 1. A whole packet has been read, we will find someone to write it
   struct evt_core_cat* cat = evt_core_get_from_cat (ctx, "tcp-write");
-  to_fdinfo = g_array_index(cat->socklist, struct evt_core_fdinfo*, 0);
+  to_fdinfo = cat->socklist->len > 0 ? g_array_index(cat->socklist, struct evt_core_fdinfo*, 0) : NULL;
   if (to_fdinfo == NULL) {
     fprintf(stderr, "No fd for cat %s in udp-read. Dropping packet :( \n", cat->name);
     mv_buffer_wtof (app_ctx, fdinfo);