diff --git a/langtools/src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java b/langtools/src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java
index 08797b63e69..dc1f5979b3c 100644
--- a/langtools/src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java
+++ b/langtools/src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java
@@ -993,7 +993,9 @@ public class ClassWriter extends ClassFile {
     /** Enter an inner class into the `innerClasses' set/queue.
      */
     void enterInner(ClassSymbol c) {
-        assert !c.type.isCompound();
+        if (c.type.isCompound()) {
+            throw new AssertionError("Unexpected intersection type: " + c.type);
+        }
         try {
             c.complete();
         } catch (CompletionFailure ex) {
diff --git a/langtools/src/share/classes/com/sun/tools/javac/jvm/Code.java b/langtools/src/share/classes/com/sun/tools/javac/jvm/Code.java
index d96613f1599..639d9c7cdc5 100644
--- a/langtools/src/share/classes/com/sun/tools/javac/jvm/Code.java
+++ b/langtools/src/share/classes/com/sun/tools/javac/jvm/Code.java
@@ -1304,7 +1304,7 @@ public class Code {
         stackCount = 0;
         for (int i=0; i<state.stacksize; i++) {
             if (state.stack[i] != null) {
-                frame.stack[stackCount++] = state.stack[i];
+                frame.stack[stackCount++] = types.erasure(state.stack[i]);
             }
         }
 
diff --git a/langtools/test/tools/javac/multicatch/Pos08.java b/langtools/test/tools/javac/multicatch/Pos08.java
new file mode 100644
index 00000000000..7491e22fd0b
--- /dev/null
+++ b/langtools/test/tools/javac/multicatch/Pos08.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2010, 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.
+ *
+ * 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.
+ */
+
+/*
+ * @test
+ * @bug 6993963
+ * @summary Multicatch: crash while compiling simple code with a multicatch parameter
+ * @compile Pos08.java
+ */
+
+class Pos08 {
+
+    interface Foo {}
+    static class X1 extends Exception implements Foo {}
+    static class X2 extends Exception implements Foo {}
+
+    void m(boolean cond) {
+        try {
+            if (cond)
+                throw new X1();
+            else
+                throw new X2();
+        }
+        catch (final X1 | X2 ex) {}
+    }
+}
diff --git a/langtools/test/tools/javac/multicatch/Pos08eff_final.java b/langtools/test/tools/javac/multicatch/Pos08eff_final.java
new file mode 100644
index 00000000000..034aa67cd58
--- /dev/null
+++ b/langtools/test/tools/javac/multicatch/Pos08eff_final.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2010, 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.
+ *
+ * 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.
+ */
+
+/*
+ * @test
+ * @bug 6993963
+ * @summary Multicatch: crash while compiling simple code with a multicatch parameter
+ * @compile Pos08eff_final.java
+ */
+
+class Pos08eff_final {
+
+    interface Foo {}
+    static class X1 extends Exception implements Foo {}
+    static class X2 extends Exception implements Foo {}
+
+    void m(boolean cond) {
+        try {
+            if (cond)
+                throw new X1();
+            else
+                throw new X2();
+        }
+        catch (X1 | X2 ex) {}
+    }
+}