diff --git a/src/x11/keymap.c b/src/x11/keymap.c
index 0e7a890..408d0eb 100644
--- a/src/x11/keymap.c
+++ b/src/x11/keymap.c
@@ -448,6 +448,7 @@ get_sym_maps(struct xkb_keymap *keymap, xcb_connection_t *conn,
                 const xkb_layout_index_t group = j / wire_sym_map->width;
                 const xkb_level_index_t level = j % wire_sym_map->width;
 
+                assert(key->groups[group].type != NULL);
                 if (level < key->groups[group].type->num_levels &&
                     wire_keysym != XKB_KEY_NoSymbol) {
                     key->groups[group].levels[level].num_syms = 1;
diff --git a/test/interactive-evdev.c b/test/interactive-evdev.c
index 4f12e67..b0b9e62 100644
--- a/test/interactive-evdev.c
+++ b/test/interactive-evdev.c
@@ -203,6 +203,7 @@ get_keyboards(struct xkb_keymap *keymap,
             continue;
         }
 
+        assert(kbd != NULL);
         kbd->next = kbds;
         kbds = kbd;
     }