diff --git a/lib/crewai/src/crewai/telemetry/telemetry.py b/lib/crewai/src/crewai/telemetry/telemetry.py
index a75fa50fa..0358418e2 100644
--- a/lib/crewai/src/crewai/telemetry/telemetry.py
+++ b/lib/crewai/src/crewai/telemetry/telemetry.py
@@ -448,7 +448,6 @@ class Telemetry:
         if not self._should_execute_telemetry():
             return None
 
-        self._safe_telemetry_operation(_operation)
         return _operation()
 
     def task_ended(self, span: Span, task: Task, crew: Crew) -> None:
diff --git a/lib/crewai/tests/telemetry/test_task_started_double_call.py b/lib/crewai/tests/telemetry/test_task_started_double_call.py
new file mode 100644
index 000000000..9c98390f7
--- /dev/null
+++ b/lib/crewai/tests/telemetry/test_task_started_double_call.py
@@ -0,0 +1,102 @@
+"""Test for issue #3757 - task_started method calls _operation twice causing freezing."""
+
+import threading
+from unittest.mock import MagicMock, patch
+
+import pytest
+from crewai import Agent, Crew, Task
+from crewai.telemetry import Telemetry
+
+
+@pytest.fixture(autouse=True)
+def cleanup_telemetry():
+    """Clean up telemetry singleton between tests."""
+    Telemetry._instance = None
+    if hasattr(Telemetry, "_lock"):
+        Telemetry._lock = threading.Lock()
+    yield
+    Telemetry._instance = None
+    if hasattr(Telemetry, "_lock"):
+        Telemetry._lock = threading.Lock()
+
+
+@pytest.mark.telemetry
+def test_task_started_does_not_call_operation_twice():
+    """Test that task_started only calls _operation once when telemetry is enabled.
+    
+    This test verifies the fix for issue #3757 where task_started was calling
+    _operation twice, causing the app to freeze when using CrewAI Tracing.
+    """
+    with patch("crewai.telemetry.telemetry.TracerProvider"):
+        telemetry = Telemetry()
+        telemetry.ready = True
+        
+        agent = Agent(
+            role="Test Agent",
+            goal="Test goal",
+            backstory="Test backstory",
+            llm="gpt-4o-mini",
+        )
+        
+        task = Task(
+            description="Test task",
+            expected_output="Test output",
+            agent=agent,
+        )
+        
+        crew = Crew(
+            agents=[agent],
+            tasks=[task],
+            name="TestCrew",
+        )
+        
+        call_count = 0
+        original_start_span = None
+        
+        def mock_start_span(name):
+            """Mock start_span to count calls."""
+            nonlocal call_count
+            call_count += 1
+            span = MagicMock()
+            span.end = MagicMock()
+            return span
+        
+        with patch("opentelemetry.trace.get_tracer") as mock_get_tracer:
+            mock_tracer = MagicMock()
+            mock_tracer.start_span = mock_start_span
+            mock_get_tracer.return_value = mock_tracer
+            
+            span = telemetry.task_started(crew, task)
+            
+            assert span is not None, "task_started should return a span when telemetry is enabled"
+            assert call_count == 2, f"Expected 2 spans (Task Created + Task Execution), but got {call_count}"
+
+
+@pytest.mark.telemetry
+def test_task_started_returns_none_when_disabled():
+    """Test that task_started returns None when telemetry is disabled."""
+    with patch.dict("os.environ", {"CREWAI_DISABLE_TELEMETRY": "true"}):
+        telemetry = Telemetry()
+        
+        agent = Agent(
+            role="Test Agent",
+            goal="Test goal",
+            backstory="Test backstory",
+            llm="gpt-4o-mini",
+        )
+        
+        task = Task(
+            description="Test task",
+            expected_output="Test output",
+            agent=agent,
+        )
+        
+        crew = Crew(
+            agents=[agent],
+            tasks=[task],
+            name="TestCrew",
+        )
+        
+        span = telemetry.task_started(crew, task)
+        
+        assert span is None, "task_started should return None when telemetry is disabled"