diff --git a/src/cmd/compile/internal/gc/swt.go b/src/cmd/compile/internal/gc/swt.go
index dc285ae91c..08ce8c44ed 100644
--- a/src/cmd/compile/internal/gc/swt.go
+++ b/src/cmd/compile/internal/gc/swt.go
@@ -640,6 +640,11 @@ func checkDupExprCases(exprname *Node, clauses []*Node) {
 			if ct := consttype(n); ct < 0 || ct == CTBOOL {
 				continue
 			}
+			// If the value has no type, we have
+			// already printed an error about it.
+			if n.Type == nil {
+				continue
+			}
 			tv := typeVal{
 				typ: n.Type.LongString(),
 				val: n.Val().Interface(),
diff --git a/test/fixedbugs/issue22063.go b/test/fixedbugs/issue22063.go
new file mode 100644
index 0000000000..bfdb2e0027
--- /dev/null
+++ b/test/fixedbugs/issue22063.go
@@ -0,0 +1,17 @@
+// errorcheck
+
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Issue 22063: panic on interface switch case with invalid name
+
+package p
+
+const X = Wrong(0) // ERROR "undefined: Wrong"
+
+func _() {
+	switch interface{}(nil) {
+	case X:
+	}
+}