diff --git a/bin/install.js b/bin/install.js
index 063752c1..c08cdae3 100755
--- a/bin/install.js
+++ b/bin/install.js
@@ -6130,6 +6130,7 @@ function finishInstall(settingsPath, settings, statuslineCommand, shouldInstallS
   const isCursor = runtime === 'cursor';
   const isWindsurf = runtime === 'windsurf';
   const isTrae = runtime === 'trae';
+  const isCline = runtime === 'cline';
 
   if (shouldInstallStatusline && !isOpencode && !isKilo && !isCodex && !isCopilot && !isCursor && !isWindsurf && !isTrae) {
     settings.statusLine = {
@@ -6140,7 +6141,7 @@ function finishInstall(settingsPath, settings, statuslineCommand, shouldInstallS
   }
 
   // Write settings when runtime supports settings.json
-  if (!isCodex && !isCopilot && !isKilo && !isCursor && !isWindsurf && !isTrae) {
+  if (!isCodex && !isCopilot && !isKilo && !isCursor && !isWindsurf && !isTrae && !isCline) {
     writeSettings(settingsPath, settings);
   }
 
@@ -6489,6 +6490,7 @@ if (process.env.GSD_TEST_MODE) {
     validateHookFields,
     preserveUserArtifacts,
     restoreUserArtifacts,
+    finishInstall,
   };
 } else {
 
diff --git a/tests/cline-install.test.cjs b/tests/cline-install.test.cjs
index e0ed7e4c..383b89c6 100644
--- a/tests/cline-install.test.cjs
+++ b/tests/cline-install.test.cjs
@@ -29,6 +29,7 @@ const {
   getConfigDirFromHome,
   convertClaudeToCliineMarkdown,
   install,
+  finishInstall,
 } = require('../bin/install.js');
 
 describe('Cline runtime directory mapping', () => {
@@ -154,6 +155,23 @@ describe('Cline install (local)', () => {
     assert.ok(fs.existsSync(engineDir), 'get-shit-done directory must exist after install');
   });
 
+  test('finishInstall does not throw ERR_INVALID_ARG_TYPE for cline runtime (regression: null settingsPath guard)', () => {
+    // install() returns settingsPath: null for cline — finishInstall() must not call
+    // writeSettings(null, ...) or it crashes with ERR_INVALID_ARG_TYPE.
+    // Before fix: isCline was missing from the writeSettings guard in finishInstall().
+    // After fix:  !isCline is in the guard, matching codex/copilot/cursor/windsurf/trae.
+    assert.doesNotThrow(
+      () => finishInstall(null, null, null, false, 'cline', false, tmpDir),
+      'finishInstall must not throw when called with null settingsPath for cline runtime'
+    );
+  });
+
+  test('settings.json is not written for cline runtime', () => {
+    finishInstall(null, null, null, false, 'cline', false, tmpDir);
+    const settingsJson = path.join(tmpDir, 'settings.json');
+    assert.ok(!fs.existsSync(settingsJson), 'settings.json must not be written for cline runtime');
+  });
+
   test('installed engine files have no leaked .claude paths', () => {
     install(false, 'cline');
     const engineDir = path.join(tmpDir, 'get-shit-done');