diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a9df9240..439f37e41 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ All notable changes to this project will be documented in this file.
 - ATA has been added to the list of known telescopes.
 
 ### Fixed
+- Bug in the `uvh5._add` method that expected keys which could be
+optional for some phase-center catalog-entry types. This was noticed as an issue when
+adding two uvh5 objects that were of type "sidereal" which did not have "info_source"
+entries in their phase-center catalogs.
 - Bug in the `look_in_catalog` utility function that expected keys which could be
 optional for some phase-center catalog-entry types. This was noticed as an issue when
 adding two uvh5 objects that were of type "sidereal" which did not have "cat_times"
diff --git a/src/pyuvdata/data/ata.LoA.C0352.uvh5_60647_62965_9760406_3c286_0001.uvh5 b/src/pyuvdata/data/ata.LoA.C0352.uvh5_60647_62965_9760406_3c286_0001.uvh5
new file mode 100644
index 000000000..2148dc7fd
Binary files /dev/null and b/src/pyuvdata/data/ata.LoA.C0352.uvh5_60647_62965_9760406_3c286_0001.uvh5 differ
diff --git a/src/pyuvdata/data/ata.LoA.C0544.uvh5_60647_62965_9760406_3c286_0001.uvh5 b/src/pyuvdata/data/ata.LoA.C0544.uvh5_60647_62965_9760406_3c286_0001.uvh5
new file mode 100644
index 000000000..ca2a9481b
Binary files /dev/null and b/src/pyuvdata/data/ata.LoA.C0544.uvh5_60647_62965_9760406_3c286_0001.uvh5 differ
diff --git a/src/pyuvdata/uvdata/uvdata.py b/src/pyuvdata/uvdata/uvdata.py
index 266a5c1d5..13666c5f5 100644
--- a/src/pyuvdata/uvdata/uvdata.py
+++ b/src/pyuvdata/uvdata/uvdata.py
@@ -1397,7 +1397,9 @@ def _consolidate_phase_center_catalogs(
             # match, so this is functionally the same source
             self._update_phase_center_id(match_id, new_id=cat_id)
             # look_in_catalog ignores the "info_source" field, so update it to match
-            self.phase_center_catalog[cat_id]["info_source"] = cat_entry["info_source"]
+            self.phase_center_catalog[cat_id]["info_source"] = cat_entry.get(
+                "info_source"
+            )
             if ignore_name:
                 # Make the names match if names were ignored in matching
                 self.phase_center_catalog[cat_id]["cat_name"] = cat_entry["cat_name"]
diff --git a/tests/uvdata/test_uvh5.py b/tests/uvdata/test_uvh5.py
index d408de6f9..b3950080e 100644
--- a/tests/uvdata/test_uvh5.py
+++ b/tests/uvdata/test_uvh5.py
@@ -362,6 +362,23 @@ def test_uvh5_optional_parameters(casa_uvfits, tmp_path):
     return
 
 
+def test_uvh5_addition():
+    inputfiles = [
+        os.path.join(
+            DATA_PATH, f"ata.LoA.C0{subband}.uvh5_60647_62965_9760406_3c286_0001.uvh5"
+        )
+        for subband in ["352", "544"]
+    ]
+
+    # write out and read back in
+    uv1, uv2 = UVData(), UVData()
+    uv1.read(inputfiles[0])
+    uv2.read(inputfiles[1])
+
+    uv1 + uv2
+    return
+
+
 @pytest.mark.filterwarnings("ignore:The uvw_array does not match the expected values")
 def test_uvh5_compression_options(casa_uvfits, tmp_path):
     """