{"record":{"id":"b267e0400adc0972","repo":"zellij-org/zellij","slug":"failed-to-find-active-pane-id-for-client-client-i","errorCode":null,"errorMessage":"failed to find active pane id for client {client_id}","messagePattern":"failed to find active pane id for client (.+?)","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"zellij-server/src/tab/mod.rs","lineNumber":4303,"sourceCode":"        raw_input_bytes_are_kitty: bool,\n        client_id: ClientId,\n    ) -> Result<bool> {\n        // returns true if a UI update should be triggered (eg. if a command pane\n        // was closed with ctrl-c)\n        let err_context = || {\n            format!(\n                \"failed to write to active terminal for client {client_id} - msg: {raw_input_bytes:?}\"\n            )\n        };\n\n        self.clear_search(client_id);\n        self.mouse_help_text_visible.clear();\n        let pane_id = if self.floating_panes.panes_are_visible() {\n            self.floating_panes\n                .get_active_pane_id(client_id)\n                .or_else(|| self.tiled_panes.get_active_pane_id(client_id))\n                .ok_or_else(|| {\n                    anyhow!(format!(\n                        \"failed to find active pane id for client {client_id}\"\n                    ))\n                })\n                .with_context(err_context)?\n        } else {\n            self.tiled_panes\n                .get_active_pane_id(client_id)\n                .with_context(err_context)?\n        };\n        // Can't use 'err_context' here since it borrows 'raw_input_bytes'\n        self.write_to_pane_id(\n            key_with_modifier,\n            raw_input_bytes,\n            raw_input_bytes_are_kitty,\n            pane_id,\n            Some(client_id),\n            None,\n        )","sourceCodeStart":4285,"sourceCodeEnd":4321,"githubUrl":"https://github.com/zellij-org/zellij/blob/98a0837077492d53dd252ab30bc3e43e41e504f4/zellij-server/src/tab/mod.rs#L4285-L4321","documentation":"Returned (and propagated with `?`) by Tab::write_to_active_terminal when floating panes are visible but neither floating_panes.get_active_pane_id nor tiled_panes.get_active_pane_id yields an active pane for the client. The write (key input bytes to the focused terminal) is aborted; unlike the editor-swap errors this is a real Result error surfaced to the caller.","triggerScenarios":"Sending keyboard input (or mouse-encoded bytes) to the active terminal while the client has no resolvable active pane: floating layer visible with no focused floating pane and no tiled fallback, or a tab with zero selectable panes. Triggered by any keypress routed through write_to_active_terminal in that state.","commonSituations":"A tab whose last pane exits while the user keeps typing; toggling floating panes to visible when no floating pane exists; transient state after closing the focused pane before focus is reassigned; automation sending keys immediately after switching tabs.","solutions":["Verify the tab still has at least one live pane; if not, open one (new pane keybinding) and retype","If it reproduces consistently after closing the last pane, upgrade zellij - focus reassignment on last-pane exit has had fixes","For embeddings/scripts, wait for a focus/render event after pane close before sending input","If persistent, collect a log with `zellij --debug` and check whether focus was left empty by a plugin"],"exampleFix":"// before\nlet pane_id = if self.floating_panes.panes_are_visible() {\n    self.floating_panes.get_active_pane_id(client_id)\n        .or_else(|| self.tiled_panes.get_active_pane_id(client_id))\n        .ok_or_else(|| anyhow!(format!(\"failed to find active pane id for client {client_id}\")))\n        .with_context(err_context)?\n} else { ... };\n\n// after: fall back to first selectable pane instead of failing input\nlet pane_id = if self.floating_panes.panes_are_visible() {\n    self.floating_panes.get_active_pane_id(client_id)\n        .or_else(|| self.tiled_panes.get_active_pane_id(client_id))\n        .or_else(|| self.tiled_panes.first_selectable_pane_id())\n        .ok_or_else(|| anyhow!(format!(\"failed to find active pane id for client {client_id}\")))\n        .with_context(err_context)?\n} else { ... };","handlingStrategy":"validation","validationCode":"// callers of write_to_active_terminal: confirm a writable pane first\nif tab.get_active_pane_id(client_id).is_none() {\n    // empty tab: input has nowhere to go\n    return Ok(());\n}","typeGuard":"fn has_writable_active_pane(tab: &Tab, client_id: ClientId) -> bool {\n    tab.get_active_pane_id(client_id).is_some()\n        || tab.get_active_pane_id_or_first_selectable(client_id).is_some()\n}","tryCatchPattern":"// input routing should drop input, not fail the session:\nmatch tab.write_to_active_terminal(key, bytes, false, client_id) {\n    Ok(()) => {},\n    Err(e) => log::debug!(\"dropping input for client {client_id}: {e:#}\"),\n}","preventionTips":["Keep at least one live terminal pane per tab when scripting key input","After closing the last pane, open a new one before sending further keys","For embedded use, gate input dispatch on tab.get_active_pane_id(client_id).is_some()"],"tags":["rust","zellij","input-routing","focus","empty-tab"],"backgroundTag":null,"analyzedSha":"98a0837077492d53dd252ab30bc3e43e41e504f4","analyzedAt":"2026-08-16T13:02:01.396Z","schemaVersion":2},"datasetVersion":"2026-08-16T13:17:31.715Z"}