GitHub user fowlerp397-tech added a comment to the discussion: Question: Encountered "Failed to save slice" error when saving chart to dashboard
Thanks for the detailed update! Since creating new charts works out just fine On Fri, Mar 13, 2026, 7:34 AM dosubot[bot] ***@***.***> wrote: > Thanks for the detailed update! Since creating new charts works but > overwriting fails, there are a couple of specific things to check: > > *1. Missing can explore permissions* > > For chart updates specifically, the user needs can explore on Superset > and can explore json on Superset > <https://github.com/apache/superset/discussions/36088> in addition to the > read/write permissions. These are often overlooked but required for the > save/overwrite operation to succeed. > > *2. NULL query_context issue* > > If the chart was originally created or modified via API (or imported), it > may have a NULL query_context > <https://github.com/apache/superset/issues/31872#issuecomment-2592899285>. > Charts in this state can fail on update. The fix is to: > > 1. Open the chart in Explore view > 2. Make a trivial change (toggle something) > 3. Save it once to regenerate the query_context > 4. Then normal updates should work > > *Recommended next steps:* > > 1. Add can explore on Superset and can explore json on Superset to one > of the user's roles > 2. Check the backend logs during the failed save—it will show the > exact permission or validation that's failing > 3. If logs mention query_context, try the manual resave workaround > above > > Can you share what shows up in the backend logs when the save fails? That > will tell us exactly what's blocking it. > > *To reply, just mention @dosu > <https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=brand-link>.* > ------------------------------ > > How did I do? Good > <https://app.dosu.dev/response-feedback/028c1241-fca1-4b7a-a900-a2fab0b3a742?feedback_type=great_response&utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=feedback-great_response> > | Irrelevant > <https://app.dosu.dev/response-feedback/028c1241-fca1-4b7a-a900-a2fab0b3a742?feedback_type=irrelevant_answer&utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=feedback-irrelevant_answer> > | Incorrect > <https://app.dosu.dev/response-feedback/028c1241-fca1-4b7a-a900-a2fab0b3a742?feedback_type=incorrect_sources&utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=feedback-incorrect_sources> > | Verbose > <https://app.dosu.dev/response-feedback/028c1241-fca1-4b7a-a900-a2fab0b3a742?feedback_type=too_verbose&utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=feedback-too_verbose> > | Hallucination > <https://app.dosu.dev/response-feedback/028c1241-fca1-4b7a-a900-a2fab0b3a742?feedback_type=hallucination&utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=feedback-hallucination> > | Report 🐛 > <https://app.dosu.dev/response-feedback/028c1241-fca1-4b7a-a900-a2fab0b3a742?feedback_type=bug_report&utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=feedback-bug_report> > | Other > <https://app.dosu.dev/response-feedback/028c1241-fca1-4b7a-a900-a2fab0b3a742?feedback_type=other&utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=feedback-other> > > [image: Chat with Dosu] > <https://app.dosu.dev/a28d3c7e-a9d3-459e-9fb6-3a6f9ff4f357/ask?utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=chat-badge> > [image: Open in Cursor] > <https://cursor.com/link/prompt?text=Thanks%20for%20the%20detailed%20update%21%20Since%20creating%20new%20charts%20works%20but%20overwriting%20fails%2C%20there%20are%20a%20couple%20of%20specific%20things%20to%20check%3A%0A%0A%2A%2A1.%20Missing%20%60can%20explore%60%20permissions%2A%2A%0A%0AFor%20chart%20updates%20specifically%2C%20the%20user%20needs%20%5B%60can%20explore%20on%20Superset%60%20and%20%60can%20explore%20json%20on%20Superset%60%5D%28https%3A//github.com/apache/superset/discussions/36088%29%20in%20addition%20to%20the%20read/write%20permissions.%20These%20are%20often%20overlooked%20but%20required%20for%20the%20save/overwrite%20operation%20to%20succeed.%0A%0A%2A%2A2.%20NULL%20query_context%20issue%2A%2A%0A%0AIf%20the%20chart%20was%20originally%20created%20or%20modified%20via%20API%20%28or%20imported%29%2C%20it%20may%20have%20a%20%5BNULL%20%60query_context%60%5D%28https%3A//github.com/apache/superset/issues/31872%23issuecomment-2592899285%29.%20Charts%20in%20this%20state%20 can%20fail%20on%20update.%20The%20fix%20is%20to%3A%0A1.%20Open%20the%20chart%20in%20Explore%20view%0A2.%20Make%20a%20trivial%20change%20%28toggle%20something%29%0A3.%20Save%20it%20once%20to%20regenerate%20the%20query_context%0A4.%20Then%20normal%20updates%20should%20work%0A%0A%2A%2ARecommended%20next%20steps%3A%2A%2A%0A%0A1.%20Add%20%60can%20explore%20on%20Superset%60%20and%20%60can%20explore%20json%20on%20Superset%60%20to%20one%20of%20the%20user%27s%20roles%0A2.%20Check%20the%20backend%20logs%20during%20the%20failed%20save%E2%80%94it%20will%20show%20the%20exact%20permission%20or%20validation%20that%27s%20failing%0A3.%20If%20logs%20mention%20%60query_context%60%2C%20try%20the%20manual%20resave%20workaround%20above%0A%0ACan%20you%20share%20what%20shows%20up%20in%20the%20backend%20logs%20when%20the%20save%20fails%3F%20That%20will%20tell%20us%20exactly%20what%27s%20blocking%20it.> > [image: Join Discord] > <https://go.dosu.dev/discord-bot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=join-discord> > [image: Share on X] > <https://twitter.com/intent/tweet?text=%40dosu_ai%20helped%20me%20solve%20this%20issue!&url=https%3A//github.com/apache/superset/discussions/38618> > > — > Reply to this email directly, view it on GitHub > <https://github.com/apache/superset/discussions/38618#discussioncomment-16111871>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/B72HASJD4JDDAIJDVKJKWBD4QO2XXAVCNFSM6AAAAACWQTMDHOVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTMMJRGE4DOMI> > . > You are receiving this because you are subscribed to this thread.Message > ID: ***@***.***> > GitHub link: https://github.com/apache/superset/discussions/38618#discussioncomment-16114371 ---- This is an automatically sent email for [email protected]. 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