diff --git a/Sources/GhosttyTerminalView.swift b/Sources/GhosttyTerminalView.swift
index 60d201255b89..db1c8a8fb889 100644
--- a/Sources/GhosttyTerminalView.swift
+++ b/Sources/GhosttyTerminalView.swift
@@ -1634,9 +1634,9 @@ class GhosttyApp {
         let timestamp = ISO8601DateFormatter().string(from: Date())
         let line = "[\(timestamp)] \(message)\n"
         if let handle = FileHandle(forWritingAtPath: initLogPath) {
-            handle.seekToEndOfFile()
-            handle.write(Data(line.utf8))
-            handle.closeFile()
+            defer { try? handle.close() }
+            guard (try? handle.seekToEnd()) != nil else { return }
+            try? handle.write(contentsOf: Data(line.utf8))
         } else {
             FileManager.default.createFile(atPath: initLogPath, contents: line.data(using: .utf8))
         }
@@ -3472,7 +3472,7 @@ class GhosttyApp {
             }
             if let handle = try? FileHandle(forWritingTo: backgroundLogURL) {
                 defer { try? handle.close() }
-                try? handle.seekToEnd()
+                guard (try? handle.seekToEnd()) != nil else { return }
                 try? handle.write(contentsOf: data)
             }
         }
@@ -4141,9 +4141,9 @@ final class TerminalSurface: Identifiable, ObservableObject {
         let timestamp = ISO8601DateFormatter().string(from: Date())
         let line = "[\(timestamp)] \(message)\n"
         if let handle = FileHandle(forWritingAtPath: surfaceLogPath) {
-            handle.seekToEndOfFile()
-            handle.write(Data(line.utf8))
-            handle.closeFile()
+            defer { try? handle.close() }
+            guard (try? handle.seekToEnd()) != nil else { return }
+            try? handle.write(contentsOf: Data(line.utf8))
         } else {
             FileManager.default.createFile(atPath: surfaceLogPath, contents: line.data(using: .utf8))
         }
@@ -4155,9 +4155,9 @@ final class TerminalSurface: Identifiable, ObservableObject {
         let timestamp = ISO8601DateFormatter().string(from: Date())
         let line = "[\(timestamp)] \(message)\n"
         if let handle = FileHandle(forWritingAtPath: sizeLogPath) {
-            handle.seekToEndOfFile()
-            handle.write(Data(line.utf8))
-            handle.closeFile()
+            defer { try? handle.close() }
+            guard (try? handle.seekToEnd()) != nil else { return }
+            try? handle.write(contentsOf: Data(line.utf8))
         } else {
             FileManager.default.createFile(atPath: sizeLogPath, contents: line.data(using: .utf8))
         }
diff --git a/Sources/WorkspaceContentView.swift b/Sources/WorkspaceContentView.swift
index 13b877817352..394b562938aa 100644
--- a/Sources/WorkspaceContentView.swift
+++ b/Sources/WorkspaceContentView.swift
@@ -695,9 +695,9 @@ extension WorkspaceContentView {
             let line = "[\(ts)] PANEL NOT FOUND for tabId=\(tab.id) ws=\(workspace.id) panelCount=\(workspace.panels.count)\n"
             let logPath = "/tmp/cmux-panel-debug.log"
             if let handle = FileHandle(forWritingAtPath: logPath) {
-                handle.seekToEndOfFile()
-                handle.write(Data(line.utf8))
-                handle.closeFile()
+                defer { try? handle.close() }
+                guard (try? handle.seekToEnd()) != nil else { return }
+                try? handle.write(contentsOf: Data(line.utf8))
             } else {
                 FileManager.default.createFile(atPath: logPath, contents: line.data(using: .utf8))
             }
diff --git a/vendor/bonsplit b/vendor/bonsplit
index 73bd9f9cfd8c..cffd9a66e9ed 160000
--- a/vendor/bonsplit
+++ b/vendor/bonsplit
@@ -1 +1 @@
-Subproject commit 73bd9f9cfd8c41ebc6f2d43eb48d3eafa4dfec00
+Subproject commit cffd9a66e9ede9aaedefcfd0c391f0ad49652d72