Stable Diffusion Prompt Error

Working with Stable Diffusion can be an exciting way to generate AI art, but it also comes with its fair share of errors and troubleshooting. As a beginner, some of the common errors you might encounter can seem cryptic. Have no fear! In this guide, I’ll walk you through some of the most frequent Stable Diffusion prompt errors and provide fixes so you can get back to creating.

Invalid Prompts Detected

One error you might come across is the dreaded “Invalid Prompts Detected.” This occurs when Stable Diffusion detects something in your prompt that violates its content policy restrictions.

To fix this:

  • Carefully review your prompt and remove any questionable content
  • Avoid over-describing violence, nudity, or other mature content
  • Use more abstract or conceptual language instead of graphic details

Retrying your prompt after making adjustments often resolves this issue.

Model Failed to Load

Seeing a “model failed to load” error means Stable Diffusion had trouble initializing the model file. This could happen because:

  • The model file is corrupted
  • There’s not enough RAM or VRAM for the model size
  • The wrong model version is loaded

To troubleshoot:

  • Try a smaller model like Stable Diffusion v1-5
  • Check your memory usage while loading the model
  • Re-download the model file to check for corruption

NaNs Exception

The “NaNs” error stands for “not a number” and arises when Stable Diffusion tries to process unexpected input that breaks its mathematical operations.

To fix this:

  • Simplify your prompt to remove any odd inputs
  • If using a Notebook, ensure the setup code matches your Python version
  • Add --disable-nan-check to the Stable Diffusion arguments

Advanced Troubleshooting for Stable Diffusion Prompts

If those basic fixes don’t resolve your issues, here are some advanced troubleshooting tips for tricky Stable Diffusion prompt errors:

Debug Your Prompt

Carefully go through your prompt word-by-word to spot any problematic terms. Remove unnecessary details and modifiers to simplify the prompt.

Adjust Configuration Arguments

Modifying configuration arguments can help resolve some errors. Useful arguments include:

  • --precision-full – Use full 32-bit precision
  • --opt-split-attention – Reduce memory usage
  • --disable-nan-check – Disable NaN checks

Seek Community Support

Ask around in the Stable Diffusion Discord or Reddit if you’re still stuck. The community is extremely helpful for troubleshooting prompt issues!


With a bit of learning and tweaking, most Stable Diffusion prompt errors can be overcome. Simplify your prompts, adjust arguments, and leverage community support whenever an issue comes up. Most importantly, don’t get discouraged! The journey to mastering AI art takes patience and perseverance.

Useful Troubleshooting Websites