diff --git a/src/kernel/connection.c b/src/kernel/connection.c
index 5bccfafd6..eecbd6c59 100644
--- a/src/kernel/connection.c
+++ b/src/kernel/connection.c
@@ -117,9 +117,11 @@ void walk_connections(region *r, void(*cb)(connection *, void *), void *data) {
     walk_i(r, borders[key], cb, data);
     for (d = 0; d != MAXDIRECTIONS; ++d) {
         region *rn = r_connect(r, d);
-        int k = reg_hashkey(rn);
-        if (k < key) {
-            walk_i(r, borders[k], cb, data);
+        if (rn) {
+            int k = reg_hashkey(rn);
+            if (k < key) {
+                walk_i(r, borders[k], cb, data);
+            }
         }
     }
 }