src/jdk/nashorn/internal/codegen/CodeGenerator.java

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@@ -683,11 +683,11 @@
             }
 
             private void scopeCall(final IdentNode node, final int flags) {
                 load(node, Type.OBJECT); // Type.OBJECT as foo() makes no sense if foo == 3
                 // ScriptFunction will see CALLSITE_SCOPE and will bind scope accordingly.
-                method.loadNull(); //the 'this'
+                method.loadUndefined(Type.OBJECT); //the 'this' object
                 method.dynamicCall(callNodeType, 2 + loadArgs(args), flags);
             }
 
             private void evalCall(final IdentNode node, final int flags) {
                 load(node, Type.OBJECT); // Type.OBJECT as foo() makes no sense if foo == 3

@@ -816,11 +816,11 @@
 
             @Override
             protected boolean enterDefault(final Node node) {
                 // Load up function.
                 load(function, Type.OBJECT); //TODO, e.g. booleans can be used as functions
-                method.loadNull(); // ScriptFunction will figure out the correct this when it sees CALLSITE_SCOPE
+                method.loadUndefined(Type.OBJECT); // ScriptFunction will figure out the correct this when it sees CALLSITE_SCOPE
                 method.dynamicCall(callNodeType, 2 + loadArgs(args), getCallSiteFlags() | CALLSITE_SCOPE);
 
                 return false;
             }
         });