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-rw-r--r--cpp/002trace2
1 files changed, 1 insertions, 1 deletions
diff --git a/cpp/002trace b/cpp/002trace
index e3ebd17e..796ad7f1 100644
--- a/cpp/002trace
+++ b/cpp/002trace
@@ -182,7 +182,7 @@ ostream& operator<<(ostream& os, unused die) {
 
 #define CLEAR_TRACE  delete Trace_stream, Trace_stream = new trace_stream;
 
-#define DUMP(layer)  cerr << Trace_stream->readable_contents(layer)
+#define DUMP(layer)  if (Trace_stream) cerr << Trace_stream->readable_contents(layer);
 
 // Trace_stream is a resource, lease_tracer uses RAII to manage it.
 string Trace_file;