diff --git a/VNC/pharmq-novnc-setup.sh b/VNC/pharmq-novnc-setup.sh
index c8ace74..0f51036 100755
--- a/VNC/pharmq-novnc-setup.sh
+++ b/VNC/pharmq-novnc-setup.sh
@@ -235,7 +235,7 @@ configure_vms() {
     # VM1 선택
     while true; do
         read -p "VM1 선택 (번호 입력): " vm1_choice </dev/tty
-        if [[ -n "${VM_INFO[$vm1_choice]}" ]]; then
+        if [[ -n "${VM_INFO[$vm1_choice]:-}" ]]; then
             IFS=':' read -r VM1_ID VM1_NAME <<< "${VM_INFO[$vm1_choice]}"
             break
         else
@@ -256,7 +256,7 @@ configure_vms() {
         [yY]|[yY][eE][sS])
             while true; do
                 read -p "VM2 선택 (번호 입력): " vm2_choice </dev/tty
-                if [[ -n "${VM_INFO[$vm2_choice]}" ]]; then
+                if [[ -n "${VM_INFO[$vm2_choice]:-}" ]]; then
                     if [ "$vm2_choice" = "$vm1_choice" ]; then
                         msg_warn "VM1과 다른 VM을 선택해주세요."
                         continue