fix

adapters/google_adapter.py

@@ -105,9 +105,21 @@ class GoogleAdapter:
             
             if response.usage_metadata:
                 token_usage = response.usage_metadata.total_token_count
-                
-            if response.parts is None and response.candidates[0].finish_reason is not None:
-                raise GoogleGenerationException(f"Generation blocked in cause of {response.candidates[0].finish_reason.value}")
+
+            # Check prompt-level block (e.g. PROHIBITED_CONTENT) — no candidates in this case
+            if response.prompt_feedback and response.prompt_feedback.block_reason:
+                raise GoogleGenerationException(
+                    f"Generation blocked at prompt level: {response.prompt_feedback.block_reason.value}"
+                )
+
+            # Check candidate-level block
+            if response.parts is None:
+                response_reason = (
+                    response.candidates[0].finish_reason
+                    if response.candidates and len(response.candidates) > 0
+                    else "Unknown"
+                )
+                raise GoogleGenerationException(f"Generation blocked: {response_reason}")
 
             generated_images = []