diff --git a/bundles/org.openhab.core.thing/src/test/java/org/openhab/core/thing/binding/generic/ChannelTransformationTest.java b/bundles/org.openhab.core.thing/src/test/java/org/openhab/core/thing/binding/generic/ChannelTransformationTest.java
index 9dd0c6914..a18fe50e8 100644
--- a/bundles/org.openhab.core.thing/src/test/java/org/openhab/core/thing/binding/generic/ChannelTransformationTest.java
+++ b/bundles/org.openhab.core.thing/src/test/java/org/openhab/core/thing/binding/generic/ChannelTransformationTest.java
@@ -14,12 +14,15 @@ package org.openhab.core.thing.binding.generic;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
 
 import java.util.List;
+import java.util.Optional;
 
 import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.eclipse.jdt.annotation.Nullable;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -59,6 +62,11 @@ public class ChannelTransformationTest {
     private static final String T3_INPUT = T2_RESULT;
     private static final String T3_RESULT = "T3Result";
 
+    private static final String NULL_NAME = T1_NAME;
+    private static final String NULL_PATTERN = "NullPattern";
+    private static final String NULL_INPUT = T1_RESULT;
+    private static final @Nullable String NULL_RESULT = null;
+
     private @Mock @NonNullByDefault({}) TransformationService transformationService1Mock;
     private @Mock @NonNullByDefault({}) TransformationService transformationService2Mock;
 
@@ -78,6 +86,8 @@ public class ChannelTransformationTest {
                 .thenAnswer(answer -> T2_RESULT);
         Mockito.when(transformationService2Mock.transform(eq(T3_PATTERN), eq(T3_INPUT)))
                 .thenAnswer(answer -> T3_RESULT);
+        Mockito.when(transformationService1Mock.transform(eq(NULL_PATTERN), eq(NULL_INPUT)))
+                .thenAnswer(answer -> NULL_RESULT);
 
         Mockito.when(serviceRef1Mock.getProperty(any())).thenReturn("TRANSFORM1");
         Mockito.when(serviceRef2Mock.getProperty(any())).thenReturn("TRANSFORM2");
@@ -105,6 +115,16 @@ public class ChannelTransformationTest {
         assertNull(result);
     }
 
+    @Test
+    public void testNullReturningTransformation() {
+        String pattern = NULL_NAME + ":" + NULL_PATTERN;
+
+        ChannelTransformation transformation = new ChannelTransformation(pattern);
+        Optional<String> result = transformation.apply(NULL_INPUT);
+
+        assertTrue(result.isEmpty());
+    }
+
     @Test
     public void testSingleTransformationWithColon() {
         String pattern = T1_NAME + ":" + T1_PATTERN;
@@ -155,6 +175,26 @@ public class ChannelTransformationTest {
         assertNull(result);
     }
 
+    @Test
+    public void testFirstTransformationReturningNull() {
+        List<String> pattern = List.of(NULL_NAME + ":" + NULL_PATTERN, T2_NAME + ":" + T2_PATTERN);
+
+        ChannelTransformation transformation = new ChannelTransformation(pattern);
+        Optional<String> result = transformation.apply(NULL_INPUT);
+
+        assertTrue(result.isEmpty());
+    }
+
+    @Test
+    public void testSecondTransformationReturningNull() {
+        List<String> pattern = List.of(T1_NAME + ":" + T1_PATTERN, NULL_NAME + ":" + NULL_PATTERN);
+
+        ChannelTransformation transformation = new ChannelTransformation(pattern);
+        Optional<String> result = transformation.apply(T1_INPUT);
+
+        assertTrue(result.isEmpty());
+    }
+
     @Test
     public void testColonDoubleTransformationWithoutSpaces() {
         String pattern = T1_NAME + ":" + T1_PATTERN + "∩" + T2_NAME + ":" + T2_PATTERN;