diff --git a/go/files.go b/go/files.go
index cff2004..5f4f576 100644
--- a/go/files.go
+++ b/go/files.go
@@ -160,7 +160,10 @@ func FilesCreateVideo() (*genai.GenerateContentResponse, error) {
 	fmt.Printf("myfile=%+v\n", myfile)
 
 	// Poll until the video file is completely processed (state becomes ACTIVE).
-	for myfile.State == genai.FileStateUnspecified || myfile.State != genai.FileStateActive {
+	for myfile.State != genai.FileStateActive {
+		if myfile.State == genai.FileStateFailed {
+			return nil, fmt.Errorf("video file processing failed: %v", myfile.State)
+		}
 		fmt.Println("Processing video...")
 		fmt.Println("File state:", myfile.State)
 		time.Sleep(5 * time.Second)
diff --git a/go/test_utils.go b/go/test_utils.go
index fb1a0e1..87b3cbb 100644
--- a/go/test_utils.go
+++ b/go/test_utils.go
@@ -25,6 +25,9 @@ func getMedia() string {
 
 // Helping for printing the response.
 func printResponse(resp *genai.GenerateContentResponse) {
+	if resp == nil {
+		return
+	}
 	for _, cand := range resp.Candidates {
 		if cand.Content != nil {
 			for _, part := range cand.Content.Parts {
diff --git a/go/test_utils_test.go b/go/test_utils_test.go
new file mode 100644
index 0000000..7697fba
--- /dev/null
+++ b/go/test_utils_test.go
@@ -0,0 +1,32 @@
+package examples
+
+import (
+	"testing"
+
+	"google.golang.org/genai"
+)
+
+func TestPrintResponseNil(t *testing.T) {
+	// Must not panic on nil response
+	printResponse(nil)
+}
+
+func TestPrintResponseEmpty(t *testing.T) {
+	resp := &genai.GenerateContentResponse{}
+	printResponse(resp)
+}
+
+func TestPrintResponseWithCandidates(t *testing.T) {
+	resp := &genai.GenerateContentResponse{
+		Candidates: []*genai.Candidate{
+			{
+				Content: &genai.Content{
+					Parts: []*genai.Part{
+						{Text: "test output"},
+					},
+				},
+			},
+		},
+	}
+	printResponse(resp)
+}
diff --git a/javascript/files.js b/javascript/files.js
index 31cd378..7094149 100644
--- a/javascript/files.js
+++ b/javascript/files.js
@@ -110,6 +110,11 @@ export async function filesCreateVideo() {
 
   // Poll until the video file is completely processed (state becomes ACTIVE).
   while (!myfile.state || myfile.state.toString() !== 'ACTIVE') {
+    if (myfile.state && myfile.state.toString() === 'FAILED') {
+      throw new Error(
+        `Video file processing failed: ${myfile.error?.message || 'state is FAILED'}`,
+      );
+    }
     console.log('Processing video...');
     console.log('File state: ', myfile.state);
     await sleep(5000);
diff --git a/python/files.py b/python/files.py
index c462104..f9bf532 100644
--- a/python/files.py
+++ b/python/files.py
@@ -80,6 +80,8 @@ def test_files_create_video(self):
 
     # Poll until the video file is completely processed (state becomes ACTIVE).
     while not myfile.state or myfile.state.name != "ACTIVE":
+      if myfile.state and myfile.state.name == "FAILED":
+        raise ValueError(f"Video file processing failed: {getattr(myfile, 'error', None) or 'state is FAILED'}")
       print("Processing video...")
       print("File state:", myfile.state)
       time.sleep(5)