--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/api/JavacTrees.java	Thu Nov 22 11:15:53 2018 +0100
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/api/JavacTrees.java	Thu Nov 22 15:38:20 2018 +0100
@@ -443,7 +443,11 @@
                 // we first check if qualifierExpression identifies a type,
                 // and if not, then we check to see if it identifies a package.
                 Type t = attr.attribType(ref.qualifierExpression, env);
-                if (t.isErroneous()) {
+
+                if (t.getKind() == TypeKind.ARRAY) {
+                    // cannot refer to an array type
+                    return null;
+                } else if (t.isErroneous()) {
                     JCCompilationUnit toplevel =
                         treeMaker.TopLevel(List.nil());
                     final ModuleSymbol msym = modules.getDefaultModule();
@@ -451,6 +455,9 @@
                     toplevel.packge = msym.unnamedPackage;
                     Symbol sym = attr.attribIdent(ref.qualifierExpression, toplevel);
 
+                    if (sym == null)
+                        return null;
+
                     sym.complete();
 
                     if ((sym.kind == PCK || sym.kind == TYP) && sym.exists()) {