diff --git a/radiospectra/spectrogram/sources/rpw.py b/radiospectra/spectrogram/sources/rpw.py
index 50c9fac..59ccdeb 100644
--- a/radiospectra/spectrogram/sources/rpw.py
+++ b/radiospectra/spectrogram/sources/rpw.py
@@ -11,7 +11,7 @@ class RPWSpectrogram(GenericSpectrogram):
 
     Examples
     --------
-    >>> import sunpy_soar
+    >>> import sunpy_soar  # doctest: +SKIP
     >>> from sunpy.net import Fido, attrs as a
     >>> from radiospectra.spectrogram import Spectrogram
     >>> query = Fido.search(a.Time('2020-07-11', '2020-07-11 23:59'), a.Instrument('RPW'),
@@ -26,4 +26,4 @@ class RPWSpectrogram(GenericSpectrogram):
 
     @classmethod
     def is_datasource_for(cls, data, meta, **kwargs):
-        return meta["instrument"] == "RPW"
+        return meta.get("instrument") == "RPW"
diff --git a/radiospectra/spectrogram/sources/tests/test_solo_rpw.py b/radiospectra/spectrogram/sources/tests/test_solo_rpw.py
index a041830..6ce716d 100644
--- a/radiospectra/spectrogram/sources/tests/test_solo_rpw.py
+++ b/radiospectra/spectrogram/sources/tests/test_solo_rpw.py
@@ -117,3 +117,12 @@ def test_solo_rpw_hfr(parse_path_moc):
     assert spec.end_time.datetime == datetime(2024, 3, 24, 0, 0, 0, 0)
     assert spec.wavelength.min == 425 * u.kHz
     assert spec.wavelength.max == 16325 * u.kHz
+
+def test_rpw_missing_instrument_key():
+    from radiospectra.spectrogram.sources.rpw import RPWSpectrogram
+
+    meta = {}  # missing "instrument"
+
+    result = RPWSpectrogram.is_datasource_for(None, meta)
+
+    assert result is False