Fixed error caused by canceling the SQL statement before it is used

main.go

@@ -63,8 +63,7 @@ func login(c *gin.Context) {
 	// check for user using given credentials
 	stmt, err := db.Prepare("SELECT * FROM users WHERE name=?")
 	checkErr(err)
-	err = stmt.Close()
-	checkErr(err)
+	defer stmt.Close()
 	var user loginOutput
 	err = stmt.QueryRow(userData.Name).Scan(&user.UID, &user.Name, &user.Password, &user.Role)
 	if err != nil {
@@ -100,8 +99,7 @@ func getTasks(c *gin.Context) {
 		}
 		tasks = append(tasks, tempTask)
 	}
-	err = rows.Close()
-	checkErr(err)
+	rows.Close()
 	var jsonTasks taskArray
 	jsonTasks.Tasks = tasks
 	c.IndentedJSON(http.StatusOK, jsonTasks)
@@ -143,8 +141,7 @@ func getHistory(c *gin.Context) {
 		}
 		history = append(history, tempHistoryData)
 	}
-	err = rows.Close()
-	checkErr(err)
+	rows.Close()
 
 	var historyRes []historyResData
 	// make the data human-readable
@@ -154,22 +151,20 @@ func getHistory(c *gin.Context) {
 		var tempUser loginOutput
 		stmt, err := db.Prepare("SELECT * FROM users WHERE uid=?")
 		checkErr(err)
-		err = stmt.Close()
-		checkErr(err)
 		err = stmt.QueryRow(history[i].UID).Scan(&tempUser.UID, &tempUser.Name, &tempUser.Password, &tempUser.Role)
 		checkErr(err)
 		tempHistory.User = tempUser.Name
+		stmt.Close()
 
 		// get the task name and points
 		var tempTask task
 		stmt, err = db.Prepare("SELECT * FROM activities WHERE taskId=?")
 		checkErr(err)
-		err = stmt.Close()
-		checkErr(err)
 		err = stmt.QueryRow(history[i].TID).Scan(&tempTask.TID, &tempTask.Name, &tempTask.Points)
 		checkErr(err)
 		tempHistory.Task = tempTask.Name
 		tempHistory.PointsGained = tempTask.Points
+		stmt.Close()
 
 		tempHistory.Time = history[i].Time
 
@@ -221,8 +216,7 @@ func main() {
 	})
 	router.Static("/frontend", "./frontend")
 
-	err := router.Run("localhost:8080")
-	checkErr(err)
+	router.Run("localhost:8080")
 }
 
 func checkErr(err error) {