diff --git a/pr_agent/algo/file_filter.py b/pr_agent/algo/file_filter.py
index fb40cfda..cc466f57 100644
--- a/pr_agent/algo/file_filter.py
+++ b/pr_agent/algo/file_filter.py
@@ -8,15 +8,24 @@ def filter_ignored(files):
     Filter out files that match the ignore patterns.
     """
 
-    # load regex patterns, and translate glob patterns to regex
-    patterns = get_settings().ignore.regex
-    patterns += [fnmatch.translate(glob) for glob in get_settings().ignore.glob]
+    try:
+        # load regex patterns, and translate glob patterns to regex
+        patterns = get_settings().ignore.regex
+        patterns += [fnmatch.translate(glob) for glob in get_settings().ignore.glob]
 
-    # compile regex patterns
-    compiled_patterns = [re.compile(r) for r in patterns]
+        # compile all valid patterns
+        compiled_patterns = []
+        for r in patterns:
+            try:
+                compiled_patterns.append(re.compile(r))
+            except re.error:
+                pass
 
-    # keep filenames that _don't_ match the ignore regex
-    for r in compiled_patterns:
-        files = [f for f in files if not r.match(f.filename)]
+        # keep filenames that _don't_ match the ignore regex
+        for r in compiled_patterns:
+            files = [f for f in files if not r.match(f.filename)]
+
+    except Exception as e:
+        print(f"Could not filter file list: {e}")
 
     return files
diff --git a/tests/unittest/test_file_filter.py b/tests/unittest/test_file_filter.py
index 4856fbb4..43e9c9b4 100644
--- a/tests/unittest/test_file_filter.py
+++ b/tests/unittest/test_file_filter.py
@@ -14,7 +14,7 @@ class TestIgnoreFilter:
             type('', (object,), {'filename': 'file4.py'})(),
             type('', (object,), {'filename': 'file5.py'})()
         ]
-        assert filter_ignored(files) == files
+        assert filter_ignored(files) == files, "Expected all files to be returned when no ignore patterns are given."
 
     def test_glob_ignores(self, monkeypatch):
         """
@@ -57,3 +57,24 @@ class TestIgnoreFilter:
 
         filtered_files = filter_ignored(files)
         assert filtered_files == expected, f"Expected {[file.filename for file in expected]}, but got {[file.filename for file in filtered_files]}."
+
+    def test_invalid_regex(self, monkeypatch):
+        """
+        Test invalid patterns are quietly ignored.
+        """
+        monkeypatch.setattr(global_settings.ignore, 'regex', ['(((||', '^file[2-4]\..*$'])
+
+        files = [
+            type('', (object,), {'filename': 'file1.py'})(),
+            type('', (object,), {'filename': 'file2.java'})(),
+            type('', (object,), {'filename': 'file3.cpp'})(),
+            type('', (object,), {'filename': 'file4.py'})(),
+            type('', (object,), {'filename': 'file5.py'})()
+        ]
+        expected = [
+            files[0],
+            files[4]
+        ]
+
+        filtered_files = filter_ignored(files)
+        assert filtered_files == expected, f"Expected {[file.filename for file in expected]}, but got {[file.filename for file in filtered_files]}."