diff --git a/PROMS/Volian.Controls.Library/StepTabRibbon.cs b/PROMS/Volian.Controls.Library/StepTabRibbon.cs
index 632c0091..46ea35f3 100644
--- a/PROMS/Volian.Controls.Library/StepTabRibbon.cs
+++ b/PROMS/Volian.Controls.Library/StepTabRibbon.cs
@@ -1693,7 +1693,8 @@ namespace Volian.Controls.Library
 			btnCpyStp.Enabled = setting;
 			//B20170-158 Allow a Unlinked Step to be pasted before or after a linked step.
 			StepTabPanel tmp = Parent as StepTabPanel;
-			if (tmp.MyDisplayTabControl.MyCopyStep != null)
+			//B2020-058: crash on null reference
+			if (tmp != null && tmp.MyDisplayTabControl != null && tmp.MyDisplayTabControl.MyCopyStep != null)
 			{
 				//B2017-180:  The fix for B2017-158 also needed the 'HasEnhancedLinkedStep' to check if the copied step is a source step
 				if (!tmp.MyDisplayTabControl.MyCopyStep.IsEnhancedStep && !tmp.MyDisplayTabControl.MyCopyStep.HasEnhancedLinkedStep)