--- old/src/hotspot/share/jfr/leakprofiler/leakProfiler.cpp	2020-02-06 19:18:06.693550042 +0100
+++ new/src/hotspot/share/jfr/leakprofiler/leakProfiler.cpp	2020-02-06 19:18:06.525550057 +0100
@@ -53,6 +53,11 @@
     return false;
   }
 
+  if (UseShenandoahGC) {
+    log_warning(jfr)("LeakProfiler is currently not supported in combination with Shenandoah GC");
+    return false;
+  }
+
   assert(!is_running(), "invariant");
   assert(sample_count > 0, "invariant");