diff --git a/src/InteractiveWindow/Editor/InteractiveWindow_UIThread.cs b/src/InteractiveWindow/Editor/InteractiveWindow_UIThread.cs
index 48c29cc94966af1891ceabf33327d05f9d0e1f5a..19dea41af25ab248ed06a3fd4a1f664fba3786a4 100644
--- a/src/InteractiveWindow/Editor/InteractiveWindow_UIThread.cs
+++ b/src/InteractiveWindow/Editor/InteractiveWindow_UIThread.cs
@@ -277,7 +277,7 @@ private void CancelStandardInput()
 
             public void InsertCode(string text)
             {
-                if (_window._stdInputStart == null)
+                if (_window._stdInputStart != null)
                 {
                     return;
                 }
diff --git a/src/InteractiveWindow/EditorTest/InteractiveWindowTests.cs b/src/InteractiveWindow/EditorTest/InteractiveWindowTests.cs
index f35b8d4aa489c4d673852c66afeba7c3d775cd5d..edc507fa93c6c7c031f22640a0b09301503aa4d9 100644
--- a/src/InteractiveWindow/EditorTest/InteractiveWindowTests.cs
+++ b/src/InteractiveWindow/EditorTest/InteractiveWindowTests.cs
@@ -288,7 +288,7 @@ public void CallReadStandardInputOnUIThread()
         [Fact]
         public void CallBackspaceOnNonUIThread()
         {
-            Window.Operations.BreakLine(); // Something to backspace.
+            Window.InsertCode("1"); // Something to backspace.
             Task.Run(() => Window.Operations.Backspace()).PumpingWait();
         }
 
@@ -308,7 +308,7 @@ public void CallClearHistoryOnNonUIThread()
         [Fact]
         public void CallClearViewOnNonUIThread()
         {
-            Window.Operations.BreakLine(); // Something to clear.
+            Window.InsertCode("1"); // Something to clear.
             Task.Run(() => Window.Operations.ClearView()).PumpingWait();
         }
 
@@ -357,7 +357,7 @@ public void CallEndOnNonUIThread()
         [Fact]
         public void CallSelectAllOnNonUIThread()
         {
-            Window.Operations.BreakLine(); // Something to select.
+            Window.InsertCode("1"); // Something to select.
             Task.Run(() => Window.Operations.SelectAll()).PumpingWait();
         }