diff --git a/misc/config_tools/configurator/src/index.css b/misc/config_tools/configurator/src/index.css
deleted file mode 100644
index ec2585e8c..000000000
--- a/misc/config_tools/configurator/src/index.css
+++ /dev/null
@@ -1,13 +0,0 @@
-body {
-  margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
-    monospace;
-}
diff --git a/misc/config_tools/configurator/src/lib/acrn.jsx b/misc/config_tools/configurator/src/lib/acrn.jsx
index 8ab4c5db7..c0762da2a 100644
--- a/misc/config_tools/configurator/src/lib/acrn.jsx
+++ b/misc/config_tools/configurator/src/lib/acrn.jsx
@@ -289,7 +289,13 @@ export class ProgramLayer extends EventBase {
                     }
                 } else {
                     //fix pci_devs is object issue
-                    if (vmConfig.hasOwnProperty("pci_devs") && vmConfig.pci_devs.hasOwnProperty("pci_dev") && _.isString(vmConfig.pci_devs.pci_dev)) {
+                    if (
+                        vmConfig.hasOwnProperty("pci_devs") &&
+                        vmConfig.pci_devs != null &&
+                        vmConfig.pci_devs.hasOwnProperty("pci_dev") &&
+                        vmConfig.pci_devs != null &&
+                        _.isString(vmConfig.pci_devs.pci_dev)
+                    ) {
                         vmConfig.pci_devs.pci_dev = [vmConfig.pci_devs.pci_dev]
                     }
                     this.addVM(vmType, vmConfig)