diff --git a/src/providers/google-vertex-ai/chatComplete.ts b/src/providers/google-vertex-ai/chatComplete.ts
index eda2f61f3..91a5c113e 100644
--- a/src/providers/google-vertex-ai/chatComplete.ts
+++ b/src/providers/google-vertex-ai/chatComplete.ts
@@ -708,7 +708,7 @@ export const GoogleChatCompleteStreamChunkTransform: (
             )
           : null;
         let message: any = { role: 'assistant', content: '' };
-        if (generation.content?.parts[0]?.text) {
+        if (generation.content?.parts?.[0]?.text) {
           const contentBlocks = [];
           let content = '';
           for (const part of generation.content.parts) {
@@ -732,7 +732,7 @@ export const GoogleChatCompleteStreamChunkTransform: (
             ...(!strictOpenAiCompliance &&
               contentBlocks.length && { content_blocks: contentBlocks }),
           };
-        } else if (generation.content?.parts[0]?.functionCall) {
+        } else if (generation.content?.parts?.[0]?.functionCall) {
           message = {
             role: 'assistant',
             tool_calls: generation.content.parts.map((part, idx) => {
@@ -753,7 +753,7 @@ export const GoogleChatCompleteStreamChunkTransform: (
               }
             }),
           };
-        } else if (generation.content?.parts[0]?.inlineData) {
+        } else if (generation.content?.parts?.[0]?.inlineData) {
           const part = generation.content.parts[0];
           const contentBlocks = [
             {
diff --git a/src/providers/google/chatComplete.test.ts b/src/providers/google/chatComplete.test.ts
new file mode 100644
index 000000000..9f04a0ec3
--- /dev/null
+++ b/src/providers/google/chatComplete.test.ts
@@ -0,0 +1,37 @@
+import { GoogleChatCompleteStreamChunkTransform } from './chatComplete';
+
+describe('GoogleChatCompleteStreamChunkTransform', () => {
+  // Gemini emits a terminating stream chunk whose candidate carries a
+  // `finishReason` and a `content` object that has NO `parts` array
+  // (e.g. finishReason "SAFETY" / "RECITATION"). The transform must not crash.
+  it('does not throw when candidate content has no parts array', () => {
+    const chunk =
+      'data: ' +
+      JSON.stringify({
+        candidates: [
+          { content: { role: 'model' }, finishReason: 'SAFETY', index: 0 },
+        ],
+        usageMetadata: {
+          promptTokenCount: 10,
+          candidatesTokenCount: 0,
+          totalTokenCount: 10,
+        },
+        modelVersion: 'gemini-1.5-pro',
+      });
+
+    const streamState: any = {};
+    let output: string = '';
+    expect(() => {
+      output = GoogleChatCompleteStreamChunkTransform(
+        chunk,
+        'fb-id',
+        streamState,
+        false
+      );
+    }).not.toThrow();
+
+    const json = JSON.parse(output.replace(/^data: /, '').trim());
+    expect(json.choices[0].finish_reason).toBe('SAFETY');
+    expect(json.choices[0].delta.content).toBe('');
+  });
+});
diff --git a/src/providers/google/chatComplete.ts b/src/providers/google/chatComplete.ts
index b550b05f5..567a7973a 100644
--- a/src/providers/google/chatComplete.ts
+++ b/src/providers/google/chatComplete.ts
@@ -812,7 +812,7 @@ export const GoogleChatCompleteStreamChunkTransform: (
                 strictOpenAiCompliance
               )
             : null;
-          if (generation.content?.parts[0]?.text) {
+          if (generation.content?.parts?.[0]?.text) {
             const contentBlocks = [];
             let content = '';
             for (const part of generation.content.parts) {
@@ -836,7 +836,7 @@ export const GoogleChatCompleteStreamChunkTransform: (
               ...(!strictOpenAiCompliance &&
                 contentBlocks.length && { content_blocks: contentBlocks }),
             };
-          } else if (generation.content?.parts[0]?.functionCall) {
+          } else if (generation.content?.parts?.[0]?.functionCall) {
             message = {
               role: 'assistant',
               tool_calls: generation.content.parts.map((part, idx) => {
@@ -857,7 +857,7 @@ export const GoogleChatCompleteStreamChunkTransform: (
                 }
               }),
             };
-          } else if (generation.content?.parts[0]?.inlineData) {
+          } else if (generation.content?.parts?.[0]?.inlineData) {
             const part = generation.content.parts[0];
             const contentBlocks = [
               {