diff --git a/python/sglang/srt/managers/mm_utils.py b/python/sglang/srt/managers/mm_utils.py
index 77f26c959cec..514dfba47c06 100644
--- a/python/sglang/srt/managers/mm_utils.py
+++ b/python/sglang/srt/managers/mm_utils.py
@@ -994,6 +994,8 @@ def embed_mm_inputs(
                     multimodal_model.separate_deepstack_embeds(embedding)
                 )
                 deepstack_embeddings += [deepstack_embedding]
+            else:
+                deepstack_embeddings += [None]
             modalities += [modality]
             embeddings += [embedding]
             masks += [mask]