diff --git a/imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageMetadata.java b/imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageMetadata.java
index dda6005c..2b3df03d 100644
--- a/imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageMetadata.java
+++ b/imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageMetadata.java
@@ -144,7 +144,7 @@ public final class TIFFImageMetadata extends AbstractMetadata {
                     IIOMetadataNode valueNode = new IIOMetadataNode("TIFFUndefined");
                     tagNode.appendChild(valueNode);
 
-                    if (count == 1) {
+                    if (count == 1 && (value == null || !value.getClass().isArray())) {
                         valueNode.setAttribute("value", String.valueOf(value));
                     }
                     else {
@@ -160,7 +160,7 @@ public final class TIFFImageMetadata extends AbstractMetadata {
                     String typeName = getMetadataType(tag);
 
                     // NOTE: ASCII/Strings have count 1, always. This seems consistent with the JAI ImageIO version.
-                    if (count == 1) {
+                    if (count == 1 && (value == null || !value.getClass().isArray())) {
                         IIOMetadataNode elementNode = new IIOMetadataNode(typeName);
                         valueNode.appendChild(elementNode);
 
@@ -915,7 +915,7 @@ public final class TIFFImageMetadata extends AbstractMetadata {
 
     public void setFromTree(final String formatName, final Node root) throws IIOInvalidTreeException {
         // Standard validation
-        super.mergeTree(formatName, root);
+        super.setFromTree(formatName, root);
 
         // Set by "merging" with empty map
         LinkedHashMap<Integer, Entry> entries = new LinkedHashMap<>();
diff --git a/imageio/imageio-tiff/src/test/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageWriterTest.java b/imageio/imageio-tiff/src/test/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageWriterTest.java
index 9f971437..f04ad28d 100644
--- a/imageio/imageio-tiff/src/test/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageWriterTest.java
+++ b/imageio/imageio-tiff/src/test/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFImageWriterTest.java
@@ -1072,6 +1072,45 @@ public class TIFFImageWriterTest extends ImageWriterAbstractTest {
         assertArrayEquals(new byte[] {'I', 'I', 42, 0}, Arrays.copyOf(bytes, 4));
     }
 
+    @Test
+    public void testMergeTreeARGB() throws IOException {
+        ImageWriter writer = createImageWriter();
+        ImageWriteParam writeParam = writer.getDefaultWriteParam();
+        writeParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
+        writeParam.setCompressionType("LZW");
+
+        IIOMetadata metadata = writer.getDefaultImageMetadata(ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_4BYTE_ABGR), writeParam);
+
+        IIOMetadataNode tiffTree = (IIOMetadataNode) metadata.getAsTree(metadata.getNativeMetadataFormatName());
+        metadata.setFromTree(metadata.getNativeMetadataFormatName(), tiffTree);
+    }
+
+    @Test
+    public void testMergeTreeGray() throws IOException {
+        ImageWriter writer = createImageWriter();
+        ImageWriteParam writeParam = writer.getDefaultWriteParam();
+        writeParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
+        writeParam.setCompressionType("LZW");
+
+        IIOMetadata metadata = writer.getDefaultImageMetadata(ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_BYTE_GRAY), writeParam);
+
+        IIOMetadataNode tiffTree = (IIOMetadataNode) metadata.getAsTree(metadata.getNativeMetadataFormatName());
+        metadata.setFromTree(metadata.getNativeMetadataFormatName(), tiffTree);
+    }
+
+    @Test
+    public void testMergeTreeBW() throws IOException {
+        ImageWriter writer = createImageWriter();
+        ImageWriteParam writeParam = writer.getDefaultWriteParam();
+        writeParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
+        writeParam.setCompressionType("CCITT T.6");
+
+        IIOMetadata metadata = writer.getDefaultImageMetadata(ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_BYTE_BINARY), writeParam);
+
+        IIOMetadataNode tiffTree = (IIOMetadataNode) metadata.getAsTree(metadata.getNativeMetadataFormatName());
+        metadata.setFromTree(metadata.getNativeMetadataFormatName(), tiffTree);
+    }
+
     @Test
     public void testRewrite() throws IOException {
         ImageWriter writer = createImageWriter();