diff --git a/lldb/source/Target/ThreadPlanTracer.cpp b/lldb/source/Target/ThreadPlanTracer.cpp
--- a/lldb/source/Target/ThreadPlanTracer.cpp
+++ b/lldb/source/Target/ThreadPlanTracer.cpp
@@ -35,11 +35,12 @@
 
 ThreadPlanTracer::ThreadPlanTracer(Thread &thread, lldb::StreamSP &stream_sp)
     : m_process(*thread.GetProcess().get()), m_tid(thread.GetID()),
-      m_single_step(true), m_enabled(false), m_stream_sp(stream_sp) {}
+      m_single_step(true), m_enabled(false), m_stream_sp(stream_sp),
+      m_thread(nullptr) {}
 
 ThreadPlanTracer::ThreadPlanTracer(Thread &thread)
     : m_process(*thread.GetProcess().get()), m_tid(thread.GetID()),
-      m_single_step(true), m_enabled(false), m_stream_sp() {}
+      m_single_step(true), m_enabled(false), m_stream_sp(), m_thread(nullptr) {}
 
 Stream *ThreadPlanTracer::GetLogStream() {
   if (m_stream_sp)