Index: generic/nsfStack.c
===================================================================
diff -u -rfbf70aa67bec4deec1078074787aafb8b66b2dde -r60604f6962105d881e376602217c2719caa1167d
--- generic/nsfStack.c	(.../nsfStack.c)	(revision fbf70aa67bec4deec1078074787aafb8b66b2dde)
+++ generic/nsfStack.c	(.../nsfStack.c)	(revision 60604f6962105d881e376602217c2719caa1167d)
@@ -726,7 +726,9 @@
 
 static void CallStackPopAll(Tcl_Interp *interp) {
 
-  NsfShowStack(interp);
+  if (RUNTIME_STATE(interp)->debugLevel > 1) {
+    NsfShowStack(interp);
+  }
 
   while (1) {
     Tcl_CallFrame *framePtr = Tcl_Interp_framePtr(interp);