Index: generic/nsfStack.c
===================================================================
diff -u -rb8ca306282c9a1000b1c93ffd97f7f4673953f65 -rb44aabd0e7bafe2698c981f6d60b2d266e66ff3b
--- generic/nsfStack.c	(.../nsfStack.c)	(revision b8ca306282c9a1000b1c93ffd97f7f4673953f65)
+++ generic/nsfStack.c	(.../nsfStack.c)	(revision b44aabd0e7bafe2698c981f6d60b2d266e66ff3b)
@@ -137,8 +137,8 @@
             Tcl_CallFrame_clientData(framePtr),
             Tcl_CallFrame_level(framePtr),
             (void *)Tcl_CallFrame_nsPtr(framePtr), Tcl_CallFrame_nsPtr(framePtr)->fullName,
-            Tcl_CallFrame_objc(framePtr) && 0 ? ObjStr(Tcl_CallFrame_objv(framePtr)[0]) : "(null)",
-            Tcl_CallFrame_objc(framePtr) ? Tcl_CallFrame_objc(framePtr) : -1);
+            Tcl_CallFrame_objc(framePtr) > 0 ? ObjStr(Tcl_CallFrame_objv(framePtr)[0]) : "(null)",
+            Tcl_CallFrame_objc(framePtr) > 0 ? Tcl_CallFrame_objc(framePtr) : -1);
     if (cscPtr != NULL) {
       fprintf(stderr, " csc %p frameType %.4x flags %.6x (%s.%p %s)\n",
 	      (void *)cscPtr,