diff --git a/gh_review_project/review_project.py b/gh_review_project/review_project.py
index 1c07b74d..31e166fe 100644
--- a/gh_review_project/review_project.py
+++ b/gh_review_project/review_project.py
@@ -142,7 +142,7 @@ def _extract_data(cls, raw_data: dict) -> list:
             if "milestone" in item_data:
                 item.milestone = item_data["milestone"]["title"]
 
-            if "assignee" in item_data:
+            if "assignees" in item_data:
                 item.assignee = item_data["assignees"]
 
             item_list.append(item)
@@ -309,7 +309,8 @@ class ProjectItem:
     number: number of the item in the repository
     title: title of the item
     repo: repository where the item is located
-    status: status of the item
+    status: status of the item in the project
+    state: item state (draft, open, merged, closed)
     milestone: title of the milestone
     """
 
@@ -325,6 +326,7 @@ def __init__(
         self.repo = repo
 
         self.status = None
+        self.state = None
         self.milestone = "None"
         self.assignee = None
 
@@ -388,6 +390,16 @@ def add_comment(self, text: str, dry_run: bool = False) -> None:
             print(message)
             run_command(command)
 
+    def check_state(self) -> str:
+        """
+        Fetch item state from gh and store to object
+        """
+        command = f"gh {self.command_type} view {self.number} --repo='{PROJECT_OWNER}/{self.repo}' --json state"
+        output = run_command(command)
+        self.state = json.loads(output.stdout)["state"]
+
+        return self.state
+
 
 class PullRequest(ProjectItem):
     """
diff --git a/gh_review_project/set_milestone.py b/gh_review_project/set_milestone.py
index 3abf209b..1995326a 100644
--- a/gh_review_project/set_milestone.py
+++ b/gh_review_project/set_milestone.py
@@ -33,15 +33,33 @@ def add_milestone(
     """
 
     print_banner(
-        f"Setting closed pull requests with no milestone to {current_milestone}"
+        f"Setting merged pull requests with no milestone to {current_milestone}"
     )
 
     closed_prs = reviews.get_milestone(milestone="None", status="closed")
 
+    archive_list = []
     if closed_prs:
         for repo in closed_prs:
             for pr in closed_prs[repo]:
-                pr.modify_milestone(current_milestone, dry_run)
+                state = pr.check_state()
+                if state == "MERGED":
+                    pr.modify_milestone(current_milestone, dry_run)
+                elif state == "CLOSED":
+                    archive_list.append(pr)
+                else:
+                    print(
+                        f"PR {pr.number} in {pr.repo} is in state {state} with "
+                        f"status {pr.status}. Please manually check it."
+                    )
+
+        if archive_list:
+            print(
+                "\nThe following PRs were closed without merging. Archive them from the project:"
+            )
+            for pr in archive_list:
+                pr.archive(REVIEW_ID, dry_run)
+                reviews.project_items.remove(pr)
     else:
         print("No closed pull requests without a milestone.")