diff --git a/PICable.py b/PICable.py
index 554c9f0..dfa37ca 100644
--- a/PICable.py
+++ b/PICable.py
@@ -14,8 +14,12 @@ MARGIN = 0.1
 def get_stars_info(owner, repo, token):
     headers = {"Authorization": f"token {token}"}
     stars_url = f"https://api.github.com/repos/{owner}/{repo}"
-    stars_response = requests.get(stars_url, headers=headers).json()
-    stars = stars_response["stargazers_count"]
+    stars_response = requests.get(stars_url, headers=headers)
+
+    if stars_response.status_code != 200:
+        return -1
+
+    stars = stars_response.json()["stargazers_count"]
     return stars
 
 
@@ -24,8 +28,12 @@ def get_commits_last_30_days(owner, repo, token):
     since = (datetime.now() - timedelta(days=30)).isoformat()
     print(since)
     commits_url = f"https://api.github.com/repos/{owner}/{repo}/commits?since={since}&per_page={LIMIT_COMMITS_30_DAYS}"
-    commits_response = requests.get(commits_url, headers=headers).json()
-    commits_30_days = len(commits_response)
+    commits_response = requests.get(commits_url, headers=headers)
+    
+    if commits_response.status_code != 200:
+        return -1
+    
+    commits_30_days = len(commits_response.json())
     return commits_30_days
 
 
@@ -33,7 +41,11 @@ def get_lines_of_code(owner, repo):
     repo_url = f"https://github.com/{owner}/{repo}.git"
     clone_dir = os.path.expanduser("~/temp/PICable")
 
-    subprocess.run(["git", "clone", repo_url, clone_dir], check=True, stdout=sys.stdout, stderr=sys.stderr)
+    try:
+        subprocess.run(["git", "clone", repo_url, clone_dir], check=True, stdout=sys.stdout, stderr=sys.stderr)
+    except:
+        return -1
+
     result = subprocess.run(["sloccount", clone_dir], capture_output=True, text=True, check=True)
     for line in result.stdout.splitlines():
         if "Total Physical Source Lines of Code (SLOC)" in line:
@@ -51,6 +63,10 @@ def PICable(owner, repository, token):
     res = ""
 
     stars = get_stars_info(owner, repository, token)
+
+    if stars == -1:
+        return "The repository does not exist or the token is invalid. ❌"
+
     if stars >= LIMIT_STARS:
         res += f"The repository has over {LIMIT_STARS} stars. ✅\n"
     elif stars >= LIMIT_STARS * (1 - MARGIN):
@@ -59,6 +75,10 @@ def PICable(owner, repository, token):
         res += f"The repository has {stars} stars, which is way below the limit of {LIMIT_STARS} stars, considering a {margin_percentage}% margin. ❌\n"
 
     commits_30_days = get_commits_last_30_days(owner, repository, token)
+
+    if commits_30_days == -1:
+        return "The repository does not exist or the token is invalid. ❌"
+
     if commits_30_days >= LIMIT_COMMITS_30_DAYS:
         res += f"The repository has over {LIMIT_COMMITS_30_DAYS} commits in the last 30 days. ✅\n"
     elif commits_30_days >= LIMIT_COMMITS_30_DAYS * (1 - MARGIN):
@@ -67,6 +87,10 @@ def PICable(owner, repository, token):
         res += f"The repository has {commits_30_days} commits in the last 30 days, which is way below the limit of {LIMIT_COMMITS_30_DAYS} commits, considering a {margin_percentage}% margin. ❌\n"
 
     nloc = get_lines_of_code(owner, repository)
+
+    if nloc == -1:
+        return "The repository does not exist. ❌"
+
     if nloc >= LIMIT_NLOC:
         res += f"The repository has over {LIMIT_NLOC} lines of code. ✅\n"
     elif nloc >= LIMIT_NLOC * (1 - MARGIN):