handle null name in CSVRecord accessors under ignoreHeaderCase

the case-insensitive header map used by ignoreHeaderCase rejects null keys, so guard the name in isMapped and get to return false / throw IllegalArgumentException like the default case-sensitive path.

Author: rootvector2

src/main/java/org/apache/commons/csv/CSVRecord.java

@@ -127,7 +127,7 @@ public String get(final String name) {
         if (headerMap == null) {
             throw new IllegalStateException("No header mapping was specified, the record values can't be accessed by name");
         }
-        final Integer index = headerMap.get(name);
+        final Integer index = name == null ? null : headerMap.get(name);
         if (index == null) {
             throw new IllegalArgumentException(String.format("Mapping for %s not found, expected one of %s", name, headerMap.keySet()));
         }
@@ -243,7 +243,7 @@ public boolean isConsistent() {
      */
     public boolean isMapped(final String name) {
         final Map<String, Integer> headerMap = getHeaderMapRaw();
-        return headerMap != null && headerMap.containsKey(name);
+        return name != null && headerMap != null && headerMap.containsKey(name);
     }
 
     /**

src/test/java/org/apache/commons/csv/CSVRecordTest.java

@@ -44,6 +44,8 @@
 import org.apache.commons.lang3.StringUtils;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 
 class CSVRecordTest {
 
@@ -228,6 +230,22 @@ void testIsSetString() {
         assertFalse(recordWithHeader.isSet("DOES NOT EXIST"));
     }
 
+    @ParameterizedTest
+    @ValueSource(booleans = { false, true })
+    void testNullNameAccessorsMatchAcrossIgnoreHeaderCase(final boolean ignoreHeaderCase) throws IOException {
+        final CSVFormat format = CSVFormat.DEFAULT.builder().setHeader().setSkipHeaderRecord(true).setIgnoreHeaderCase(ignoreHeaderCase).get();
+        try (CSVParser parser = CSVParser.parse("A,B\n1,2", format)) {
+            final CSVRecord rec = parser.iterator().next();
+            // A null name is never a mapped header, so the boolean guards return false rather than throwing,
+            // regardless of ignoreHeaderCase (the case-insensitive header map rejects null keys).
+            assertFalse(rec.isMapped(null));
+            assertFalse(rec.isSet((String) null));
+            // A null name (also reached from get((Enum) null)) reports a missing mapping, not an NPE.
+            assertThrows(IllegalArgumentException.class, () -> rec.get((String) null));
+            assertThrows(IllegalArgumentException.class, () -> rec.get((Enum<?>) null));
+        }
+    }
+
     @Test
     void testIterator() {
         int i = 0;