diff --git a/tools/llm_bench/llm_bench_utils/gen_output_data.py b/tools/llm_bench/llm_bench_utils/gen_output_data.py
index 99dc74740c..3b7c668c82 100644
--- a/tools/llm_bench/llm_bench_utils/gen_output_data.py
+++ b/tools/llm_bench/llm_bench_utils/gen_output_data.py
@@ -25,10 +25,10 @@ def gen_iterate_data(
     iter_data['generation_time'] = gen_time
     iter_data['latency'] = latency
     iter_data['result_md5'] = res_md5
-    iter_data['first_token_latency'] = ''
-    iter_data['other_tokens_avg_latency'] = ''
-    iter_data['first_token_infer_latency'] = ''
-    iter_data['other_tokens_infer_avg_latency'] = ''
+    iter_data['first_token_latency'] = -1
+    iter_data['other_tokens_avg_latency'] = -1
+    iter_data['first_token_infer_latency'] = -1
+    iter_data['other_tokens_infer_avg_latency'] = -1
     iter_data['max_rss_mem_consumption'] = max_rss_mem
     iter_data['max_shared_mem_consumption'] = max_shared_mem
     iter_data['max_uss_mem_consumption'] = max_uss_mem
diff --git a/tools/llm_bench/prompts/stable-diffusion.jsonl b/tools/llm_bench/prompts/stable-diffusion.jsonl
index 59c23064a5..1dda44e0b4 100644
--- a/tools/llm_bench/prompts/stable-diffusion.jsonl
+++ b/tools/llm_bench/prompts/stable-diffusion.jsonl
@@ -1 +1,2 @@
-{"steps":"30", "width":"256", "height":"256", "guidance_scale":"1.0", "prompt": "side profile centered painted portrait, Gandhi rolling a blunt, Gloomhaven, matte painting concept art, art nouveau, 8K HD Resolution, beautifully background"}
\ No newline at end of file
+{"steps":"30", "width":"256", "height":"256", "guidance_scale":"1.0", "prompt": "side profile centered painted portrait, Gandhi rolling a blunt, Gloomhaven, matte painting concept art, art nouveau, 8K HD Resolution, beautifully background"}
+{"prompt": "side profile centered painted portrait, Gandhi rolling a blunt, Gloomhaven, matte painting concept art, art nouveau, 8K HD Resolution, beautifully background"}
diff --git a/tools/llm_bench/task/image_generation.py b/tools/llm_bench/task/image_generation.py
index 678b2dd43b..b6260568bf 100644
--- a/tools/llm_bench/task/image_generation.py
+++ b/tools/llm_bench/task/image_generation.py
@@ -45,10 +45,11 @@ def run_image_generation(image_param, num, image_id, pipe, args, iter_data_list,
     set_seed(args['seed'])
     input_text = image_param['prompt']
     input_args = collects_input_args(image_param, args['model_type'], args['model_name'])
-    log.info(
-        f"[{'warm-up' if num == 0 else num}][P{image_id}] Input params: Batch_size={args['batch_size']}, "
-        f'steps={input_args["num_inference_steps"]}, width={input_args["width"]}, height={input_args["height"]}, guidance_scale={input_args["guidance_scale"]}'
-    )
+    out_str = f"Input params: Batch_size={args['batch_size']}, " \
+              f"steps={input_args['num_inference_steps']}, width={input_args['width']}, height={input_args['height']}"
+    if 'guidance_scale' in input_args:
+        out_str += f", guidance_scale={input_args['guidance_scale']}"
+    log.info(f"[{'warm-up' if num == 0 else num}][P{image_id}]{out_str}")
 
     result_md5_list = []
     max_rss_mem_consumption = ''
@@ -107,10 +108,12 @@ def run_image_generation_genai(image_param, num, image_id, pipe, args, iter_data
     set_seed(args['seed'])
     input_text = image_param['prompt']
     input_args = collects_input_args(image_param, args['model_type'], args['model_name'])
-    log.info(
-        f"[{'warm-up' if num == 0 else num}][P{image_id}] Input params: Batch_size={args['batch_size']}, "
-        f'steps={input_args["num_inference_steps"]}, width={input_args["width"]}, height={input_args["height"]}, guidance_scale={input_args["guidance_scale"]}'
-    )
+    out_str = f"Input params: Batch_size={args['batch_size']}, " \
+              f"steps={input_args['num_inference_steps']}, width={input_args['width']}, height={input_args['height']}"
+    if 'guidance_scale' in input_args:
+        out_str += f", guidance_scale={input_args['guidance_scale']}"
+    log.info(f"[{'warm-up' if num == 0 else num}][P{image_id}] {out_str}")
+
     result_md5_list = []
     max_rss_mem_consumption = ''
     max_uss_mem_consumption = ''