diff --git a/src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_diffedit.py b/src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_diffedit.py
index adada63b83..e48d8a4642 100644
--- a/src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_diffedit.py
+++ b/src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_diffedit.py
@@ -560,7 +560,7 @@ class StableDiffusionDiffEditPipeline(DiffusionPipeline, TextualInversionLoaderM
             uncond_tokens: List[str]
             if negative_prompt is None:
                 uncond_tokens = [""] * batch_size
-            elif type(prompt) is not type(negative_prompt):
+            elif prompt is not None and type(prompt) is not type(negative_prompt):
                 raise TypeError(
                     f"`negative_prompt` should be the same type to `prompt`, but got {type(negative_prompt)} !="
                     f" {type(prompt)}."