To reproduce:

Create the following 3 source files:

////// A.java
public class A<T extends B<T>> {
    public void foo() {}
}
 
////// B.java
public class B<T> {}

////// C.java
public class C {
    public static void crashJavaC(A a) {
        a.foo(null);
    }
}


$ javac A.java B.java
$ rm B.java B.class
$ javac C.java

An exception has occurred in the compiler (11.0.6). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.

java.lang.NullPointerException
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.visitSelect(TransTypes.java:811)
                at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2114)
                at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:454)
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.visitApply(TransTypes.java:622)
                at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1634)
                at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:454)
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.visitExec(TransTypes.java:599)
                at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1452)
                at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
                at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
                at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:167)
                at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1020)
                at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:454)
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.visitMethodDef(TransTypes.java:489)
                at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:866)
                at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
                at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
                at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.visitClassDef(TreeTranslator.java:139)
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.translateClass(TransTypes.java:918)
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.visitClassDef(TransTypes.java:475)
                at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:774)
                at jdk.compiler/com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:454)
                at jdk.compiler/com.sun.tools.javac.comp.TransTypes.translateTopLevelClass(TransTypes.java:942)
                at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1553)
                at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1432)
                at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:973)
                at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:311)
                at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:170)
                at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:57)
                at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:43)