diff --git a/.gitignore b/.gitignore
index 8068375..dc3d2c0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -112,3 +112,4 @@ dmypy.json
 
 # database files (may contain sensitive student info)
 *.db
+.vscode
diff --git a/TODO.md b/TODO.md
index 1ba19ec..0e407ad 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,7 +2,7 @@ To-Do List
 ==========
 
 ## v0.2
-- [ ] Error handling (when entering invalid data types)
+- [x] Error handling (when entering invalid data types)
 - [ ] Make database contain data for all classes
 - [ ] Flexible mandatory subjects
 
diff --git a/ib-clearance.py b/ib-clearance.py
index b7e3382..3469c12 100755
--- a/ib-clearance.py
+++ b/ib-clearance.py
@@ -102,23 +102,26 @@ def main():
 
     y = "y"
     while y == "y":
-        id = int(input("Please input the student ID number: "))
+        try:
+            id = int(input("Please input the student ID number: "))
 
-        if check_id(conn, id):
-            day = get_lower_weekday()
-            raw_time = select_final_time(conn, day, id)
-            # if raw_time is None, student has no lessons today
-            if raw_time != None:
-                final_time = parse_time_string(raw_time)
-                current_time = parse_time_string(time.strftime("%H:%M"))
-                if current_time > final_time:
+            if check_id(conn, id):
+                day = get_lower_weekday()
+                raw_time = select_final_time(conn, day, id)
+                # if raw_time is None, student has no lessons today
+                if raw_time != None:
+                    final_time = parse_time_string(raw_time)
+                    current_time = parse_time_string(time.strftime("%H:%M"))
+                    if current_time > final_time:
+                        print("Clear to leave.")
+                    else:
+                        print("Student does not have clearance.")
+                elif raw_time == None:
                     print("Clear to leave.")
-                else:
-                    print("Student does not have clearance.")
-            elif raw_time == None:
-                print("Clear to leave.")
-        else:
-            print("Student does not exist in the database. Please try again.")
+            else:
+                print("Student does not exist in the database. Please try again.")
+        except ValueError:
+            print("That was not an integer, please try again.")
 
         y = input("Press y key followed by enter to run again.")