diff --git a/ui/src/views/tools/ImportUnmanagedInstance.vue b/ui/src/views/tools/ImportUnmanagedInstance.vue
index a03ef3866ec..9eb74877365 100644
--- a/ui/src/views/tools/ImportUnmanagedInstance.vue
+++ b/ui/src/views/tools/ImportUnmanagedInstance.vue
@@ -713,7 +713,7 @@ export default {
         page: 1
       })
       this.fetchKvmHostsForConversion()
-      if (this.resource.disk.length > 1) {
+      if (this.resource?.disk?.length > 1) {
         this.updateSelectedRootDisk()
       }
     },
diff --git a/ui/src/views/tools/ManageInstances.vue b/ui/src/views/tools/ManageInstances.vue
index a869768bf39..b61c8a9efa5 100644
--- a/ui/src/views/tools/ManageInstances.vue
+++ b/ui/src/views/tools/ManageInstances.vue
@@ -1074,6 +1074,7 @@ export default {
       this.sourceHypervisor = value
       this.sourceActions = this.AllSourceActions.filter(x => x.sourceDestHypervisors[value])
       this.form.sourceAction = this.sourceActions[0].name || ''
+      this.selectedVmwareVcenter = undefined
       this.onSelectSourceAction(this.form.sourceAction)
     },
     onSelectSourceAction (value) {