diff --git a/src/core/app/services/task.service.ts b/src/core/app/services/task.service.ts
index 40e406c..d971667 100644
--- a/src/core/app/services/task.service.ts
+++ b/src/core/app/services/task.service.ts
@@ -121,11 +121,6 @@ async function createTask(newTask: BareboneTask): Promise<Task | null> {
       throw new Error('Worked hours must be lower than or equal to 1000');
     }
 
-    const createdTask = await TaskRepository.createTask(task);
-    if (!createdTask) {
-      throw new Error('Task already exists');
-    }
-
     if (newTask.endDate && project.endDate && !dateSmallerOrEqualThanOther(newTask.endDate, project.endDate))
       throw new Error("Task's end date cannot be after the project's end date");
 
@@ -135,6 +130,11 @@ async function createTask(newTask: BareboneTask): Promise<Task | null> {
     if (newTask.startDate && project.endDate && !dateSmallerOrEqualThanOther(newTask.startDate, project.endDate))
       throw new Error("Task's start date cannot be after the project's end date");
 
+    const createdTask = await TaskRepository.createTask(task);
+    if (!createdTask) {
+      throw new Error('Task already exists');
+    }
+
     if (newTask.idEmployee) {
       const employee = await EmployeeRepository.findById(newTask.idEmployee);
       if (!employee) {