diff --git a/pyfiglet/__init__.py b/pyfiglet/__init__.py
index 545d9d9..e0aaf5a 100755
--- a/pyfiglet/__init__.py
+++ b/pyfiglet/__init__.py
@@ -170,16 +170,25 @@ def preloadFont(cls, font:str):
 
     @classmethod
     def isValidFont(cls, font:str):
+        """
+        This function checks if the font given is valid or not.
+        Font file name is taken as argument. Hence, ".flf" and ".tlf" must be added 
+        to the argument; otherwise, the function returns False.
+
+        """
         if not font.endswith(('.flf', '.tlf')):
             return False
         f = None
         full_file = os.path.join(SHARED_DIRECTORY, font)
-        if os.path.isfile(font):
-            f = open(font, 'rb')
-        elif os.path.isfile(full_file):
-            f = open(full_file, 'rb')
-        else:
-            f = importlib.resources.files('pyfiglet.fonts').joinpath(font).open('rb')
+        try: # Catches FileNotFoundError in case any of the open()s encounters it.
+            if os.path.isfile(font):
+                f = open(font, 'rb')
+            elif os.path.isfile(full_file):
+                f = open(full_file, 'rb')
+            else:
+                f = importlib.resources.files('pyfiglet.fonts').joinpath(font).open('rb')
+        except FileNotFoundError:
+            return False
 
         if zipfile.is_zipfile(f):
             # If we have a match, the ZIP file spec says we should just read the first file in the ZIP.
diff --git a/pyfiglet/test.py b/pyfiglet/test.py
index 7df002c..5eaabed 100755
--- a/pyfiglet/test.py
+++ b/pyfiglet/test.py
@@ -5,6 +5,7 @@
 import sys
 from optparse import OptionParser
 from pyfiglet import Figlet
+from pyfiglet import FigletFont
 from subprocess import Popen, PIPE
 try:
     from colorama import init
@@ -101,6 +102,8 @@ def check_result(self):
             print('FAILED = %s' % set(self.failed))
 
         return self.failed, self.oked
+    def test_invalid_font_file():
+        assert FigletFont.isValidFont("does_not_exist.flf") is False
 
 def banner(text):
     cprint(Figlet().renderText(text), "blue")
@@ -122,6 +125,7 @@ def main():
     test.check_text("Averylongwordthatwillbecutatsomepoint I hope", False)
     banner("TESTING explicit new line")
     test.check_text("line1\nline2", True)
+    test.test_invalid_font_file()
     if len(test.check_result()[0]) == 0:
         return 0
     else: