Editor Script OnEnable() being executed whatever I do when pressing play in editor.

So I have an editor script for a scriptable object. After a lot of effort managed to make it work properly in the editor, but when I press play, even if the inspector is empty or "Inspecting" another object, this scriptable object's editor scripts gets executed like 180 times. When I made it print what was the "target", or the item I was supposedly inspecting in the editor, it returned "null". So I made if(target ==null) return; which works... but I can't help but feel disturbed when I know everytime I press play that script will be executed 180 times for no reason. Any Ideas? One last thing I wanted to explain is that this scriptable object is only used as complex data type inside another scriptable object "AttackData" that contain several of these "AttackPhase". The code is this:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEditor;
 
 [CustomEditor(typeof(AttackPhase))]
 [CanEditMultipleObjects]
 public class AttackPhaseEditor : Editor
 {
     public bool showPhase;
 
     private string phaseName = null;
     protected AttackPhase myAttackPhase;
 
     SerializedProperty isFoldedInEditor;
 
     SerializedProperty duration;
     SerializedProperty restrictRotation;
     SerializedProperty rotationSpeed;
     SerializedProperty hasHitbox;
     SerializedProperty hitboxPrefab;
 
 
 
     private void OnEnable()
     {
         Init();
     }
 
 
     protected virtual void Init()
     {
         if (target == null) return;
         myAttackPhase = (AttackPhase)target;
 
         isFoldedInEditor = serializedObject.FindProperty("isFoldedInEditor");
 
         duration = serializedObject.FindProperty("duration");
         restrictRotation = serializedObject.FindProperty("restrictRotation");
         rotationSpeed = serializedObject.FindProperty("rotationSpeed");
         hasHitbox = serializedObject.FindProperty("hasHitbox");
         hitboxPrefab = serializedObject.FindProperty("hitboxPrefab");
     }
 
     public override void OnInspectorGUI()
     {
         serializedObject.Update();
 
         EditorGUILayout.BeginVertical(GUI.skin.box);
         EditorGUI.indentLevel++;
 
         EditorGUILayout.BeginHorizontal();
 
         isFoldedInEditor.boolValue = EditorGUILayout.Foldout(isFoldedInEditor.boolValue, phaseName);
 
         EditorGUILayout.EndHorizontal();
 
         if (isFoldedInEditor.boolValue)
         {
             DrawPhase();
         }
 
         EditorGUI.indentLevel--;
         EditorGUILayout.EndVertical();
 
         serializedObject.ApplyModifiedProperties();
     }
 
     protected virtual void DrawPhase()
     {
         EditorGUILayout.PropertyField(duration);
         EditorGUILayout.PropertyField(restrictRotation);
         if (restrictRotation.boolValue)
         {
             EditorGUILayout.PropertyField(rotationSpeed);
         }
 
         EditorGUILayout.BeginHorizontal();
         hasHitbox.boolValue = EditorGUILayout.Toggle(hasHitbox.boolValue, GUILayout.Width(25));
         if (hasHitbox.boolValue)
         {
             hitboxPrefab.objectReferenceValue = EditorGUILayout.ObjectField(
                 new GUIContent("Hitbox Prefab", "Add the hitbox prefab"), hitboxPrefab.objectReferenceValue, typeof(GameObject), false);
         }
         else
         {
             GUILayout.Space(12);
             GUILayout.Label("Hitbox Prefab", GUILayout.Width(100));
 
         }
         EditorGUILayout.EndHorizontal();
     }
 
     public void SetUpEditorData(string name, AttackPhase attackPhase)
     {
         if(phaseName == null){
             phaseName = name;
         }
     }