diff --git a/subsys/modem/modem_cmux.c b/subsys/modem/modem_cmux.c
index 7f2728958e8..a14d20d4456 100644
--- a/subsys/modem/modem_cmux.c
+++ b/subsys/modem/modem_cmux.c
@@ -1042,14 +1042,18 @@ static void modem_cmux_dlci_open_handler(struct k_work *item)
 
 static void modem_cmux_dlci_close_handler(struct k_work *item)
 {
-	struct k_work_delayable *dwork = k_work_delayable_from_work(item);
-	struct modem_cmux_dlci *dlci = CONTAINER_OF(dwork, struct modem_cmux_dlci, close_work);
-	struct modem_cmux *cmux = dlci->cmux;
+	struct k_work_delayable *dwork;
+	struct modem_cmux_dlci *dlci;
+	struct modem_cmux *cmux;
 
-	if (cmux == NULL) {
+	if (item == NULL) {
 		return;
 	}
 
+	dwork = k_work_delayable_from_work(item);
+	dlci = CONTAINER_OF(dwork, struct modem_cmux_dlci, close_work);
+	cmux = dlci->cmux;
+
 	dlci->state = MODEM_CMUX_DLCI_STATE_CLOSING;
 
 	struct modem_cmux_frame frame = {