diff --git a/core/src/main/java/com/google/adk/codeexecutors/CodeExecutionUtils.java b/core/src/main/java/com/google/adk/codeexecutors/CodeExecutionUtils.java
index b9afdcaff..a4d3771c3 100644
--- a/core/src/main/java/com/google/adk/codeexecutors/CodeExecutionUtils.java
+++ b/core/src/main/java/com/google/adk/codeexecutors/CodeExecutionUtils.java
@@ -34,6 +34,7 @@
 import java.util.Optional;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import org.jspecify.annotations.Nullable;
 
 /** Utility functions for code execution. */
 public final class CodeExecutionUtils {
@@ -237,8 +238,7 @@ public abstract static class CodeExecutionInput extends JsonBaseModel {
 
     public static Builder builder() {
       return new AutoValue_CodeExecutionUtils_CodeExecutionInput.Builder()
-          .inputFiles(ImmutableList.of())
-          .executionId(Optional.empty());
+          .inputFiles(ImmutableList.of());
     }
 
     /** Builder for {@link CodeExecutionInput}. */
@@ -248,7 +248,7 @@ public abstract static class Builder {
 
       public abstract Builder inputFiles(List<File> inputFiles);
 
-      public abstract Builder executionId(Optional<String> executionId);
+      public abstract Builder executionId(@Nullable String executionId);
 
       public abstract CodeExecutionInput build();
     }
diff --git a/core/src/main/java/com/google/adk/flows/llmflows/CodeExecution.java b/core/src/main/java/com/google/adk/flows/llmflows/CodeExecution.java
index f2cbe967e..d76cd1a04 100644
--- a/core/src/main/java/com/google/adk/flows/llmflows/CodeExecution.java
+++ b/core/src/main/java/com/google/adk/flows/llmflows/CodeExecution.java
@@ -240,7 +240,8 @@ private static Flowable<Event> runPreProcessor(
                                     .code(codeStr)
                                     .inputFiles(ImmutableList.of(file))
                                     .executionId(
-                                        getOrSetExecutionId(invocationContext, codeExecutorContext))
+                                        getOrSetExecutionId(invocationContext, codeExecutorContext)
+                                            .orElse(null))
                                     .build());
 
                         codeExecutorContext.updateCodeExecutionResult(
@@ -320,7 +321,9 @@ private static Flowable<Event> runPostProcessor(
                       CodeExecutionInput.builder()
                           .code(codeStr)
                           .inputFiles(codeExecutorContext.getInputFiles())
-                          .executionId(getOrSetExecutionId(invocationContext, codeExecutorContext))
+                          .executionId(
+                              getOrSetExecutionId(invocationContext, codeExecutorContext)
+                                  .orElse(null))
                           .build());
               codeExecutorContext.updateCodeExecutionResult(
                   invocationContext.invocationId(),
diff --git a/core/src/test/java/com/google/adk/flows/llmflows/CodeExecutionTest.java b/core/src/test/java/com/google/adk/flows/llmflows/CodeExecutionTest.java
index 353504dac..1485ca2c4 100644
--- a/core/src/test/java/com/google/adk/flows/llmflows/CodeExecutionTest.java
+++ b/core/src/test/java/com/google/adk/flows/llmflows/CodeExecutionTest.java
@@ -20,6 +20,7 @@
 import static com.google.adk.testing.TestUtils.createTestAgentBuilder;
 import static com.google.adk.testing.TestUtils.createTestLlm;
 import static com.google.common.truth.Truth.assertThat;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.verify;
@@ -32,14 +33,19 @@
 import com.google.adk.codeexecutors.CodeExecutionUtils.CodeExecutionInput;
 import com.google.adk.codeexecutors.CodeExecutionUtils.CodeExecutionResult;
 import com.google.adk.events.Event;
+import com.google.adk.flows.llmflows.RequestProcessor.RequestProcessingResult;
+import com.google.adk.models.LlmRequest;
 import com.google.adk.models.LlmResponse;
 import com.google.adk.sessions.InMemorySessionService;
 import com.google.adk.sessions.Session;
 import com.google.adk.testing.TestLlm;
 import com.google.common.collect.ImmutableList;
+import com.google.genai.types.Blob;
 import com.google.genai.types.Content;
 import com.google.genai.types.Part;
 import io.reactivex.rxjava3.core.Single;
+import io.reactivex.rxjava3.observers.TestObserver;
+import java.util.ArrayList;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
@@ -115,4 +121,38 @@ public void testResponseProcessor_withCode_executesCode() {
     assertThat(executionResultPart.codeExecutionResult().get().output())
         .hasValue("Code execution result:\nhello\n\n");
   }
+
+  @Test
+  public void testRequestProcessor_withCode_hasNoErrors() throws Exception {
+    // arrange
+    LlmRequest.Builder llmReqBuilder = LlmRequest.builder();
+    when(mockCodeExecutor.codeBlockDelimiters())
+        .thenReturn(ImmutableList.of(ImmutableList.of("```tool_code", "\n```")));
+    when(mockCodeExecutor.optimizeDataFile()).thenReturn(true);
+    when(mockCodeExecutor.errorRetryAttempts()).thenReturn(2);
+    CodeExecutionResult executionResult = CodeExecutionResult.builder().stdout("hello\n").build();
+    when(mockCodeExecutor.executeCode(any(), any())).thenReturn(executionResult);
+    llmReqBuilder.contents(
+        new ArrayList<>(
+            ImmutableList.of(
+                Content.builder()
+                    .role("user")
+                    .parts(
+                        ImmutableList.of(
+                            Part.builder()
+                                .inlineData(
+                                    Blob.builder()
+                                        .mimeType("text/csv")
+                                        .data("1,2,3\n".getBytes(UTF_8)))
+                                .build()))
+                    .build())));
+
+    // act
+    Single<RequestProcessingResult> result =
+        CodeExecution.requestProcessor.processRequest(invocationContext, llmReqBuilder.build());
+    TestObserver<RequestProcessingResult> testObserver = result.test();
+
+    // assert
+    testObserver.assertNoErrors();
+  }
 }