diff --git a/pyproject.toml b/pyproject.toml
index 47452ec..84ce896 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,8 @@ ignore = [
 ]
 
 [tool.ruff.lint.isort]
-classes = ["LRU", "OS"]
+classes = ["OS"]
+known-first-party = ["ua_parser"]
 combine-as-imports = true
 
 [tool.mypy]
diff --git a/src/ua_parser/re2.py b/src/ua_parser/re2.py
index c8cdd0b..a95cd2b 100644
--- a/src/ua_parser/re2.py
+++ b/src/ua_parser/re2.py
@@ -16,6 +16,11 @@
 )
 
 
+class DummyFilter:
+    def Match(self) -> None:
+        pass
+
+
 class Resolver:
     ua: re2.Filter
     user_agent_matchers: List[Matcher[UserAgent]]
@@ -30,26 +35,35 @@ def __init__(
     ) -> None:
         self.user_agent_matchers, self.os_matchers, self.device_matchers = matchers
 
-        self.ua = re2.Filter()
-        for u in self.user_agent_matchers:
-            self.ua.Add(u.pattern)
-        self.ua.Compile()
+        if self.user_agent_matchers:
+            self.ua = re2.Filter()
+            for u in self.user_agent_matchers:
+                self.ua.Add(u.pattern)
+            self.ua.Compile()
+        else:
+            self.ua = DummyFilter()
 
-        self.os = re2.Filter()
-        for o in self.os_matchers:
-            self.os.Add(o.pattern)
-        self.os.Compile()
+        if self.os_matchers:
+            self.os = re2.Filter()
+            for o in self.os_matchers:
+                self.os.Add(o.pattern)
+            self.os.Compile()
+        else:
+            self.os = DummyFilter()
 
-        self.devices = re2.Filter()
-        for d in self.device_matchers:
-            # Prepend the i global flag if IGNORECASE is set. Assumes
-            # no pattern uses global flags, but since they're not
-            # supported in JS that seems safe.
-            if d.flags & re.IGNORECASE:
-                self.devices.Add("(?i)" + d.pattern)
-            else:
-                self.devices.Add(d.pattern)
-        self.devices.Compile()
+        if self.device_matchers:
+            self.devices = re2.Filter()
+            for d in self.device_matchers:
+                # Prepend the i global flag if IGNORECASE is set. Assumes
+                # no pattern uses global flags, but since they're not
+                # supported in JS that seems safe.
+                if d.flags & re.IGNORECASE:
+                    self.devices.Add("(?i)" + d.pattern)
+                else:
+                    self.devices.Add(d.pattern)
+            self.devices.Compile()
+        else:
+            self.devices = DummyFilter()
 
     def __call__(self, ua: str, domains: Domain, /) -> PartialParseResult:
         user_agent = os = device = None
diff --git a/tests/test_re2.py b/tests/test_re2.py
new file mode 100644
index 0000000..88f6dfe
--- /dev/null
+++ b/tests/test_re2.py
@@ -0,0 +1,13 @@
+import pytest  # type: ignore
+
+from ua_parser import Domain, PartialParseResult
+
+re2 = pytest.importorskip("ua_parser.re2")
+
+
+def test_empty(capfd: pytest.CaptureFixture[str]) -> None:
+    r = re2.Resolver(([], [], []))
+    assert r("", Domain.ALL) == PartialParseResult(Domain.ALL, None, None, None, "")
+    out, err = capfd.readouterr()
+    assert out == ""
+    assert err == ""