{"record":{"id":"303f2ddd1f97fd9e","repo":"zellij-org/zellij","slug":"failed-to-find-active-pane","errorCode":null,"errorMessage":"Failed to find active pane","messagePattern":"Failed to find active pane","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"warning","filePath":"zellij-server/src/tab/mouse_handler.rs","lineNumber":894,"sourceCode":"            MouseAction::NoAction => Ok(MouseEffect::default()),\n        }\n    }\n\n    fn execute_stop_resize(\n        tab: &mut Tab,\n        position: Position,\n        client_id: ClientId,\n    ) -> Result<MouseEffect> {\n        let err_context = || \"failed to stop resize\";\n        let never_resized = Self::stop_pane_resize_with_mouse(tab, position, client_id)\n            .with_context(err_context)?;\n        if never_resized {\n            let pane_id_at_position = Self::get_pane_at(tab, &position, false)\n                .with_context(err_context)?\n                .map(|p| p.pid());\n            let active_pane_id = tab\n                .get_active_pane_id(client_id)\n                .ok_or_else(|| anyhow!(\"Failed to find active pane\"))?;\n            if let Some(pane_id) = pane_id_at_position {\n                if pane_id != active_pane_id {\n                    Self::focus_pane_at(tab, &position, client_id).with_context(err_context)?;\n                }\n            }\n        }\n        Ok(MouseEffect::state_changed())\n    }\n\n    fn execute_focus_pane(\n        tab: &mut Tab,\n        position: Position,\n        client_id: ClientId,\n    ) -> Result<MouseEffect> {\n        let err_context = || \"failed to focus pane\";\n        clear_hover_for_client(tab, client_id);\n        let active_pane_id_before = tab\n            .get_active_pane_id(client_id)","sourceCodeStart":876,"sourceCodeEnd":912,"githubUrl":"https://github.com/zellij-org/zellij/blob/98a0837077492d53dd252ab30bc3e43e41e504f4/zellij-server/src/tab/mouse_handler.rs#L876-L912","documentation":"Returned in the mouse handler's stop-resize path (err_context 'failed to stop resize') when, after a mouse-resize gesture ends without resizing, tab.get_active_pane_id cannot resolve the client's active pane. The code wants to compare/focus the pane under the cursor, but without an active pane id it errors out instead.","triggerScenarios":"Releasing a mouse button that was (or looked like) a pane-resize drag on a tab where the client has no resolvable active pane - empty tab, focus not yet assigned, or the focused pane exited during the drag.","commonSituations":"Mouse-up after a long drag during which the focused pane's process exited; clicking on a tab whose panes all closed; using the mouse immediately after attaching, before focus settled; automated mouse-event injection into an empty tab.","solutions":["Click once on a live pane to re-establish focus, then retry the gesture","Verify the tab still has panes; open one if the tab is empty","If this recurs during normal mouse use, upgrade zellij and check for pane-exit race fixes","Capture logs with `zellij --debug` to identify which pane-exit path left focus empty"],"exampleFix":"// before\nlet active_pane_id = tab\n    .get_active_pane_id(client_id)\n    .ok_or_else(|| anyhow!(\"Failed to find active pane\"))?;\n\n// after: skip focus comparison when there is nothing focused\nlet Some(active_pane_id) = tab.get_active_pane_id(client_id) else {\n    return Ok(MouseEffect::default());\n};","handlingStrategy":"validation","validationCode":"// guard the focus comparison after a resize gesture\nif tab.get_active_pane_id(client_id).is_none() {\n    return Ok(MouseEffect::default());\n}","typeGuard":"fn has_active_pane(tab: &Tab, client_id: ClientId) -> bool {\n    tab.get_active_pane_id(client_id).is_some()\n}","tryCatchPattern":"// mouse-event entry point: log and continue on transient focus gaps\nif let Err(e) = tab.handle_mouse_event(&event, client_id) {\n    log::debug!(\"mouse event dropped: {e:#}\");\n}","preventionTips":["Ensure a focused pane exists before interacting with the mouse after pane exits","Reset mouse gesture state (resize/selection) whenever the tab's pane set changes","Avoid starting drags on tabs that just lost their last pane"],"tags":["rust","zellij","mouse","resize","focus"],"backgroundTag":null,"analyzedSha":"98a0837077492d53dd252ab30bc3e43e41e504f4","analyzedAt":"2026-08-16T13:02:01.396Z","schemaVersion":2},"datasetVersion":"2026-08-16T13:17:31.715Z"}