--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/objects/NativeFunction.java	2017-11-03 10:57:52.063166700 +0530
+++ new/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/objects/NativeFunction.java	2017-11-03 10:57:49.629620100 +0530
@@ -35,6 +35,7 @@
 import java.util.List;
 import jdk.dynalink.linker.support.Lookup;
 import jdk.nashorn.api.scripting.JSObject;
+import jdk.nashorn.api.scripting.ScriptObjectMirror;
 import jdk.nashorn.internal.objects.annotations.Attribute;
 import jdk.nashorn.internal.objects.annotations.Constructor;
 import jdk.nashorn.internal.objects.annotations.Function;
@@ -101,8 +102,13 @@
 
         if (self instanceof ScriptFunction) {
             return ScriptRuntime.apply((ScriptFunction)self, thiz, args);
-        } else if (self instanceof JSObject) {
+        } else if (self instanceof ScriptObjectMirror) {
             return ((JSObject)self).call(thiz, args);
+        } else if (self instanceof JSObject) {
+            final Global global = Global.instance();
+            final Object result = ((JSObject) self).call(ScriptObjectMirror.wrap(thiz, global),
+                    ScriptObjectMirror.wrapArray(args, global));
+            return ScriptObjectMirror.unwrap(result, global);
         }
         throw new AssertionError("Should not reach here");
     }
--- /dev/null	2017-11-03 10:58:09.000000000 +0530
+++ new/test/nashorn/src/jdk/nashorn/internal/runtime/test/JDK_8186807_Test.java	2017-11-03 10:58:06.412797800 +0530
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.nashorn.internal.runtime.test;
+
+import jdk.nashorn.api.scripting.AbstractJSObject;
+import jdk.nashorn.api.scripting.NashornScriptEngine;
+import jdk.nashorn.api.scripting.NashornScriptEngineFactory;
+import jdk.nashorn.api.scripting.ScriptObjectMirror;
+import static org.testng.Assert.assertEquals;
+import org.testng.annotations.Test;
+import javax.script.ScriptException;
+
+
+/**
+ * @test
+ * @bug 8186807
+ * @summary JSObject gets ScriptFunction when ScriptObjectMirror is expected
+ * @modules jdk.scripting.nashorn/jdk.nashorn.internal.runtime
+ * @run testng/othervm -Dnashorn.unstable.relink.threshold=1 jdk.nashorn.internal.runtime.test.JDK_8186807_Test
+ */
+
+public class JDK_8186807_Test {
+
+    @Test
+    public void testScript() throws ScriptException {
+        NashornScriptEngine engine = (NashornScriptEngine) new NashornScriptEngineFactory().getScriptEngine();
+        engine.put("a", new func());
+        engine.eval("var fn=function() {}\n" +
+                "var arr = [ a, fn, a ];\n" +
+                "for (i in arr) {\n" +
+                "    Function.prototype.apply.apply(arr[i],[null,[fn]]);\n" +
+                "}");
+    }
+
+    static class func extends AbstractJSObject {
+        @Override
+        public boolean isFunction() {
+            return true;
+        }
+
+        @Override
+        public Object call(Object thiz, Object... args) {
+            assertEquals(args[0].getClass(), ScriptObjectMirror.class);
+            return 1;
+        }
+    }
+}