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Fix Flux2LoraLoaderMixin crash on modular pipeline sub-pipes #13996

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Fix Flux2LoraLoaderMixin crash on modular pipeline sub-pipes #13996

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12 changes: 11 additions & 1 deletion src/diffusers/loaders/lora_pipeline.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5914,9 +5914,19 @@ def load_lora_weights(
if not is_correct_format:
raise ValueError("Invalid LoRA checkpoint. Make sure all LoRA param names contain `'lora'` substring.")

try:
transformer = getattr(self, self.transformer_name) if not hasattr(self, "transformer") else self.transformer
except AttributeError:
logger.warning(
f"Could not load LoRA weights into {type(self).__name__}. "
f"The `{self.transformer_name}` attribute is not available on this sub-pipeline. "
"Load LoRA weights on the main pipeline instance instead."
)
return

self.load_lora_into_transformer(
state_dict,
transformer=getattr(self, self.transformer_name) if not hasattr(self, "transformer") else self.transformer,
transformer=transformer,
adapter_name=adapter_name,
metadata=metadata,
_pipeline=self,
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