{"record":{"id":"691bd667ea87a46d","repo":"DioxusLabs/dioxus","slug":"parent-mount","errorCode":null,"errorMessage":"parent mount","messagePattern":"parent mount","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"packages/core/src/diff/placement.rs","lineNumber":334,"sourceCode":"        &self,\n        parent_mount: MountId,\n        version: ParentVersion,\n        f: impl FnOnce(&VNode) -> Option<T>,\n    ) -> Option<T> {\n        if let Some(frame) = self\n            .context\n            .and_then(|context| context.for_mount(parent_mount))\n        {\n            let vnode = match version {\n                ParentVersion::Old => frame.old,\n                ParentVersion::New => frame.new,\n            };\n            f(vnode)\n        } else {\n            let vnode = self\n                .dom\n                .current_mounted_view(parent_mount)\n                .expect(\"parent mount\");\n            f(&vnode)\n        }\n    }\n\n    fn vnode_first_site(&self, vnode: MountedVNode<'_>) -> Option<InsertionSite> {\n        vnode\n            .find_first_element(self.dom)\n            .map(InsertionSite::before)\n    }\n\n    fn anchor_site(&self, anchor: DynamicAnchor<'_>, anchor_id: ElementId) -> InsertionSite {\n        if anchor.is_parent_append_target() {\n            InsertionSite::append_to(anchor_id)\n        } else if anchor.is_last_static_node() {\n            InsertionSite::after(anchor_id)\n        } else {\n            InsertionSite::before(anchor_id)\n        }","sourceCodeStart":316,"sourceCodeEnd":352,"githubUrl":"https://github.com/DioxusLabs/dioxus/blob/24f6a829df0dfa203961a98ea4cae21c2ff27e28/packages/core/src/diff/placement.rs#L316-L352","documentation":"Internal invariant: resolving a slot required reading a parent mount's current vnode, but the mount table had no view for that MountId. The mount was removed or never committed — a framework consistency bug.","triggerScenarios":"Thrown at packages/core/src/diff/placement.rs:334 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["This is an internal invariant about parent mounts. Report it with a minimal reproduction to the Dioxus issue tracker."],"exampleFix":null,"handlingStrategy":"type-guard","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"24f6a829df0dfa203961a98ea4cae21c2ff27e28","analyzedAt":"2026-08-23T07:10:14.078Z","contentChangedAt":"2026-08-23T07:10:14.078Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}