diff --git a/src/thread_list.cc b/src/thread_list.cc
index 1a342da..43a8561 100644
--- a/src/thread_list.cc
+++ b/src/thread_list.cc
@@ -75,7 +75,7 @@
 #endif
   if (delta == -1 && thread->suspend_count_ <= 0) {
     // This is expected if you attach a thread during a GC.
-    if (thread->GetState() != kStarting) {
+    if (thread->GetState() != kStarting && thread->GetPeer() != NULL) {
       LOG(FATAL) << *thread << " suspend count already zero";
     }
     return;