diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index d217ae9..539d273 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -4361,7 +4361,13 @@
     uint32_t npid = (cdw10 >> 1) + 1;
     unsigned int i = 0;
     g_autofree uint16_t *pids = NULL;
-    uint32_t maxnpid = n->subsys->endgrp.fdp.nrg * n->subsys->endgrp.fdp.nruh;
+    uint32_t maxnpid;
+
+    if (!ns->endgrp || !ns->endgrp->fdp.enabled) {
+        return NVME_FDP_DISABLED | NVME_DNR;
+    }
+
+    maxnpid = n->subsys->endgrp.fdp.nrg * n->subsys->endgrp.fdp.nruh;
 
     if (unlikely(npid >= MIN(NVME_FDP_MAXPIDS, maxnpid))) {
         return NVME_INVALID_FIELD | NVME_DNR;
@@ -6900,7 +6906,7 @@
     case NVME_DIRECTIVE_IDENTIFY:
         switch (doper) {
         case NVME_DIRECTIVE_RETURN_PARAMS:
-            if (ns->endgrp->fdp.enabled) {
+            if (ns->endgrp && ns->endgrp->fdp.enabled) {
                 id.supported |= 1 << NVME_DIRECTIVE_DATA_PLACEMENT;
                 id.enabled |= 1 << NVME_DIRECTIVE_DATA_PLACEMENT;
                 id.persistent |= 1 << NVME_DIRECTIVE_DATA_PLACEMENT;