diff --git a/ion/src/main/java/com/fasterxml/jackson/dataformat/ion/IonParser.java b/ion/src/main/java/com/fasterxml/jackson/dataformat/ion/IonParser.java
index d4352a976..265f54720 100644
--- a/ion/src/main/java/com/fasterxml/jackson/dataformat/ion/IonParser.java
+++ b/ion/src/main/java/com/fasterxml/jackson/dataformat/ion/IonParser.java
@@ -269,14 +269,23 @@ public String getText() throws IOException
          if (_currToken != null) { // null only before/after document
             switch (_currToken) {
             case FIELD_NAME:
-                return getCurrentName();
+                return currentName();
             case VALUE_STRING:
                 try {
-                    // stringValue() will throw an UnknownSymbolException if we're
-                    // trying to get the text for a symbol id that cannot be resolved.
                     return _reader.stringValue();
                 } catch (UnknownSymbolException e) {
+                    // stringValue() will throw an UnknownSymbolException if we're
+                    // trying to get the text for a symbol id that cannot be resolved.
+                    // stringValue() has an assert statement which could throw an
                     throw _constructError(e.getMessage(), e);
+                } catch (AssertionError e) {
+                    // AssertionError if we're trying to get the text with a symbol
+                    // id less than or equals to 0.
+                    String msg = e.getMessage();
+                    if (msg == null) {
+                        msg = "UNKNOWN ROOT CAUSE";
+                    }
+                    throw _constructError("Internal `IonReader` error: "+msg, e);
                 }
             case VALUE_NUMBER_INT:
             case VALUE_NUMBER_FLOAT:
@@ -487,24 +496,35 @@ public Object getTypeId() throws IOException {
      */
 
     @Override
-    public JsonLocation getCurrentLocation() {
+    public JsonLocation currentLocation() {
         return JsonLocation.NA;
     }
 
     @Override
-    public String getCurrentName() throws IOException {
-        return _parsingContext.getCurrentName();
+    public JsonLocation currentTokenLocation() {
+        return JsonLocation.NA;
     }
 
+    @Deprecated // since 2.17
     @Override
-    public JsonStreamContext getParsingContext() {
-        return _parsingContext;
-    }
+    public JsonLocation getCurrentLocation() { return currentLocation(); }
 
+    @Deprecated // since 2.17
+    @Override
+    public JsonLocation getTokenLocation() { return currentTokenLocation(); }
 
     @Override
-    public JsonLocation getTokenLocation() {
-        return JsonLocation.NA;
+    public String currentName() throws IOException {
+        return _parsingContext.getCurrentName();
+    }
+
+    @Deprecated // since 2.17
+    @Override
+    public String getCurrentName() throws IOException { return currentName(); }
+    
+    @Override
+    public JsonStreamContext getParsingContext() {
+        return _parsingContext;
     }
 
     @Override
@@ -529,6 +549,8 @@ public JsonToken nextToken() throws IOException
             type = _reader.next();
         } catch (IonException e) {
             _wrapError(e.getMessage(), e);
+        } catch (IndexOutOfBoundsException e) {
+            _constructError(e.getMessage(), e);
         }
         if (type == null) {
             if (_parsingContext.inRoot()) { // EOF?
@@ -614,7 +636,7 @@ public JsonParser skipChildren() throws IOException
      *****************************************************************
      * Internal helper methods
      *****************************************************************
-      */
+     */
 
     protected JsonToken _tokenFromType(IonType type)
     {
diff --git a/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/Fuzz417_64721InvalidIonTest.java b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/Fuzz417_64721InvalidIonTest.java
new file mode 100644
index 000000000..b51e4a460
--- /dev/null
+++ b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/Fuzz417_64721InvalidIonTest.java
@@ -0,0 +1,33 @@
+package com.fasterxml.jackson.dataformat.ion.fuzz;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.fail;
+
+import org.hamcrest.Matchers;
+import org.junit.Test;
+
+import com.fasterxml.jackson.core.exc.StreamReadException;
+import com.fasterxml.jackson.dataformat.ion.*;
+
+// [dataformats-binary#417]
+public class Fuzz417_64721InvalidIonTest
+{
+    enum EnumFuzz {
+        A, B, C, D, E;
+    }
+
+    @Test
+    public void testFuzz64721AssertionException() throws Exception {
+       IonFactory f = IonFactory
+                          .builderForBinaryWriters()
+                          .enable(IonParser.Feature.USE_NATIVE_TYPE_ID)
+                          .build();
+       IonObjectMapper mapper = IonObjectMapper.builder(f).build();
+       try {
+           mapper.readValue("$0/", EnumFuzz.class);
+           fail("Should not pass (invalid content)");
+       } catch (StreamReadException e) {
+           assertThat(e.getMessage(), Matchers.containsString("Internal `IonReader` error"));
+       }
+    }
+}
diff --git a/ion/tc1 b/ion/tc1
new file mode 100644
index 000000000..72932169b
Binary files /dev/null and b/ion/tc1 differ