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 e9c6c3894..e4eb7ab12 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
@@ -397,7 +397,12 @@ public NumberType getNumberType() throws IOException
                 //Ion decimals can be arbitrary precision, need to read as big decimal
                 return NumberType.BIG_DECIMAL;
             case INT:
-                IntegerSize size = _reader.getIntegerSize();
+                IntegerSize size = null;
+                try {
+                    size = _reader.getIntegerSize();
+                } catch (NullPointerException e) {
+                    // Possible exception
+                }
                 if (size == null) {
                     _reportError("Current token (%s) not integer", _currToken);
                 }
diff --git a/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/Fuzz434_65268_65274_NPETest.java b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/Fuzz434_65268_65274_NPETest.java
new file mode 100644
index 000000000..950e8084c
--- /dev/null
+++ b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/Fuzz434_65268_65274_NPETest.java
@@ -0,0 +1,60 @@
+package com.fasterxml.jackson.dataformat.ion.fuzz;
+
+import java.io.InputStream;
+
+import org.hamcrest.Matchers;
+import org.junit.Test;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonToken;
+import com.fasterxml.jackson.core.exc.StreamReadException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.dataformat.ion.*;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import java.io.*;
+import java.nio.file.*;
+
+// [dataformats-binary#434
+public class Fuzz434_65268_65274_NPETest
+{
+    @Test
+    public void testFuzz65268() throws Exception {
+        final IonFactory factory =
+            IonFactory.builderForTextualWriters().build();
+        try (InputStream in = getClass().getResourceAsStream("/data/fuzz-65268.ion")) {
+           try (JsonParser p = factory.createParser(in)) {
+               p.nextToken();
+               p.getText();
+               p.nextTextValue();
+               p.getNumberType();
+           }
+           fail("Should not pass (invalid content)");
+       } catch (StreamReadException e) {
+           assertThat(e.getMessage(), Matchers.containsString("not integer"));
+       }
+    }
+
+    @Test
+    public void testFuzz65274() throws Exception {
+        final ObjectMapper MAPPER =
+            IonObjectMapper.builder(
+                    IonFactory.builderForBinaryWriters()
+                        .enable(IonParser.Feature.USE_NATIVE_TYPE_ID)
+                        .build())
+                 .build();
+
+        try (InputStream in = getClass().getResourceAsStream("/data/fuzz-65274.ion")) {
+           byte[] invalid = in.readAllBytes();
+           try (JsonParser p = MAPPER.getFactory().createParser(new ByteArrayInputStream(invalid))) {
+               MAPPER.readTree(p);
+           }
+           fail("Should not pass (invalid content)");
+       } catch (StreamReadException e) {
+           assertThat(e.getMessage(), Matchers.containsString("not integer"));
+       }
+    }
+}
diff --git a/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/Fuzz434_65268_NPETest.java b/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/Fuzz434_65268_NPETest.java
deleted file mode 100644
index 12606799b..000000000
--- a/ion/src/test/java/com/fasterxml/jackson/dataformat/ion/fuzz/Fuzz434_65268_NPETest.java
+++ /dev/null
@@ -1,37 +0,0 @@
-package com.fasterxml.jackson.dataformat.ion.fuzz;
-
-import java.io.InputStream;
-
-import org.hamcrest.Matchers;
-import org.junit.Test;
-
-import com.fasterxml.jackson.core.JsonParser;
-import com.fasterxml.jackson.core.JsonToken;
-import com.fasterxml.jackson.core.exc.StreamReadException;
-import com.fasterxml.jackson.dataformat.ion.*;
-
-import static org.hamcrest.MatcherAssert.assertThat;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.fail;
-
-// [dataformats-binary#434
-public class Fuzz434_65268_NPETest
-{
-    private final IonFactory factory =
-        IonFactory.builderForTextualWriters().build();
-
-    @Test
-    public void testFuzz65268() throws Exception {
-       try (InputStream in = getClass().getResourceAsStream("/data/fuzz-65268.ion")) {
-           try (JsonParser p = factory.createParser(in)) {
-               p.nextToken();
-               p.getText();
-               p.nextTextValue();
-               p.getNumberType();
-           }
-           fail("Should not pass (invalid content)");
-       } catch (StreamReadException e) {
-           assertThat(e.getMessage(), Matchers.containsString("not integer"));
-       }
-    }
-}
diff --git a/ion/src/test/resources/data/fuzz-65274.ion b/ion/src/test/resources/data/fuzz-65274.ion
new file mode 100644
index 000000000..5e6ca06fd
Binary files /dev/null and b/ion/src/test/resources/data/fuzz-65274.ion differ