diff --git a/tools/demobench/src/main/kotlin/net/corda/demobench/views/NodeTabView.kt b/tools/demobench/src/main/kotlin/net/corda/demobench/views/NodeTabView.kt
index a50930a2a0..44f08f93b7 100644
--- a/tools/demobench/src/main/kotlin/net/corda/demobench/views/NodeTabView.kt
+++ b/tools/demobench/src/main/kotlin/net/corda/demobench/views/NodeTabView.kt
@@ -185,7 +185,7 @@ class NodeTabView : Fragment() {
         if (config != null) {
             nodeConfigView.isVisible = false
             nodeTab.text = config.legalName
-            nodeTerminalView.open(config, onExit = { onTabClose(config) })
+            nodeTerminalView.open(config, onExit = { onTerminalExit(config) })
 
             nodeTab.setOnSelectionChanged {
                 if (nodeTab.isSelected) {
@@ -196,7 +196,7 @@ class NodeTabView : Fragment() {
         }
     }
 
-    private fun onTabClose(config: NodeConfig) {
+    private fun onTerminalExit(config: NodeConfig) {
         Platform.runLater {
             nodeTab.requestClose()
             nodeController.dispose(config)
diff --git a/tools/demobench/src/main/kotlin/net/corda/demobench/views/NodeTerminalView.kt b/tools/demobench/src/main/kotlin/net/corda/demobench/views/NodeTerminalView.kt
index 04203a51d1..b511ccbecf 100644
--- a/tools/demobench/src/main/kotlin/net/corda/demobench/views/NodeTerminalView.kt
+++ b/tools/demobench/src/main/kotlin/net/corda/demobench/views/NodeTerminalView.kt
@@ -33,6 +33,7 @@ class NodeTerminalView : Fragment() {
     private val viewDatabaseButton by fxid<Button>()
     private val launchExplorerButton by fxid<Button>()
 
+    private var isClosed: Boolean = false
     private val explorer = explorerController.explorer()
     private val viewer = DBViewer()
     private var rpc: NodeRPC? = null
@@ -114,10 +115,13 @@ class NodeTerminalView : Fragment() {
     })
 
     fun close() {
-        explorer.close()
-        viewer.close()
-        rpc?.close()
-        pty?.close()
+        if (!isClosed) {
+            explorer.close()
+            viewer.close()
+            rpc?.close()
+            pty?.close()
+            isClosed = true
+        }
     }
 
     fun refreshTerminal() {