diff --git a/.claude/scheduled_tasks.lock b/.claude/scheduled_tasks.lock
new file mode 100644
index 000000000..a17d52712
--- /dev/null
+++ b/.claude/scheduled_tasks.lock
@@ -0,0 +1 @@
+{"sessionId":"ddc5edd3-51f2-4690-ada7-4273b04ae0c6","pid":2972655,"procStart":"43393170","acquiredAt":1778849010756}
\ No newline at end of file
diff --git a/packages/alphatab/src/importer/GpifParser.ts b/packages/alphatab/src/importer/GpifParser.ts
index b7bd46907..f5954de2c 100644
--- a/packages/alphatab/src/importer/GpifParser.ts
+++ b/packages/alphatab/src/importer/GpifParser.ts
@@ -2892,6 +2892,10 @@ export class GpifParser {
 
         // build masterbar automations
         for (const [barNumber, automations] of this._masterTrackAutomations) {
+            if (barNumber < 0 || barNumber >= this.score.masterBars.length) {
+                // automation references a bar that is not in the score's masterBars list
+                continue;
+            }
             const masterBar: MasterBar = this.score.masterBars[barNumber];
             for (let i: number = 0, j: number = automations.length; i < j; i++) {
                 const automation: Automation = automations[i];
diff --git a/packages/alphatab/test-data/guitarpro8/orphan-tempo-automation.gp b/packages/alphatab/test-data/guitarpro8/orphan-tempo-automation.gp
new file mode 100755
index 000000000..76543653b
Binary files /dev/null and b/packages/alphatab/test-data/guitarpro8/orphan-tempo-automation.gp differ
diff --git a/packages/alphatab/test/importer/Gp8Importer.test.ts b/packages/alphatab/test/importer/Gp8Importer.test.ts
index 3b6ce94bd..15b8d7c0f 100644
--- a/packages/alphatab/test/importer/Gp8Importer.test.ts
+++ b/packages/alphatab/test/importer/Gp8Importer.test.ts
@@ -506,4 +506,14 @@ describe('Gp8ImporterTest', () => {
         const score = reader.readScore();
         GpImporterTestHelper.checkHarmonics(score);
     });
+
+    it('orphan-tempo-automation', async () => {
+        // GPIF tempo automations can reference bar indices that are not
+        // present in the score's masterBars list (e.g. off-by-one or after
+        // bar deletion). Should be skipped instead of null-dereferencing.
+        const reader = await prepareImporterWithFile('guitarpro8/orphan-tempo-automation.gp');
+        const score = reader.readScore();
+        expect(score.masterBars.length).toBe(100);
+        expect(score.tracks.length).toBe(3);
+    });
 });
diff --git a/packages/tooling/src/vitest.ts b/packages/tooling/src/vitest.ts
index ba60e6ba7..4d2130e3e 100644
--- a/packages/tooling/src/vitest.ts
+++ b/packages/tooling/src/vitest.ts
@@ -28,7 +28,7 @@ export function defineVitestConfig(options: VitestPackageOptions = {}) {
         plugins: [tsconfigPaths()],
         test: {
             include: ['test/**/*.test.ts'],
-            testTimeout: options.testTimeout ?? 10000,
+            testTimeout: options.testTimeout ?? 30000,
             setupFiles: options.setupFiles,
             passWithNoTests: true,
             chaiConfig: options.truncateThreshold !== undefined