--- a/src/java.net.http/share/classes/jdk/internal/net/http/Http2Connection.java	Wed Jun 20 18:23:56 2018 +0100
+++ b/src/java.net.http/share/classes/jdk/internal/net/http/Http2Connection.java	Fri Jun 22 19:40:37 2018 +0100
@@ -673,7 +673,11 @@
         client2.deleteConnection(this);
         List<Stream<?>> c = new LinkedList<>(streams.values());
         for (Stream<?> s : c) {
-            s.connectionClosing(t);
+            try {
+                s.connectionClosing(t);
+            } catch (Throwable e) {
+                Log.logError("Failed to close stream {0}: {1}", s.streamid, e);
+            }
         }
         connection.close();
     }