From 3148accf51687c5250771af8d9f13641ce0127d9 Mon Sep 17 00:00:00 2001
From: William Joye <wjoye@cfa.harvard.edu>
Date: Thu, 7 Mar 2019 15:49:50 -0500
Subject: fix segv Marker Op delete

---
 tkblt/generic/tkbltGrMarkerOp.C | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tkblt/generic/tkbltGrMarkerOp.C b/tkblt/generic/tkbltGrMarkerOp.C
index 5103a3d..0865556 100644
--- a/tkblt/generic/tkbltGrMarkerOp.C
+++ b/tkblt/generic/tkbltGrMarkerOp.C
@@ -275,7 +275,7 @@ static int DeleteOp(ClientData clientData, Tcl_Interp* interp,
 	Tcl_AppendResult(interp, "can't find markers in \"",
 			 Tk_PathName(graphPtr->tkwin_), "\":", NULL);
       }
-      Tcl_AppendResult(interp, " ", Tcl_GetString(objv[ii]));
+      Tcl_AppendResult(interp, " ", Tcl_GetString(objv[ii]), NULL);
       res = TCL_ERROR;
     } else {
       markerPtr = (Marker*)Tcl_GetHashValue(hPtr);
-- 
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