--- old/src/hotspot/share/jfr/leakprofiler/leakProfiler.cpp	2018-06-19 14:00:40.760515918 +0200
+++ new/src/hotspot/share/jfr/leakprofiler/leakProfiler.cpp	2018-06-19 14:00:40.480503789 +0200
@@ -42,6 +42,11 @@
 
 static volatile jbyte suspended = 0;
 bool LeakProfiler::start(jint sample_count) {
+  if (UseZGC) {
+    log_warning(jfr)("LeakProfiler is currently not supported in combination with ZGC");
+    return false;
+  }
+
   if (_object_sampler != NULL) {
     // already started
     return true;