diff --git a/src/unihan_db/importer.py b/src/unihan_db/importer.py
index 3e3aa3c9..15d14543 100644
--- a/src/unihan_db/importer.py
+++ b/src/unihan_db/importer.py
@@ -261,12 +261,15 @@ def import_char(
 
     if "kGSR" in char:
         for d in char["kGSR"]:
+            assert isinstance(d, dict)
             k = kGSR(set=d["set"], letter=d["letter"], apostrophe=d["apostrophe"])
             c.kGSR.append(k)
 
     if "kCheungBauerIndex" in char:
         d = char["kCheungBauerIndex"]
         k = kCheungBauerIndex()
+        assert isinstance(d, dict)
+        assert isinstance(d["location"], dict)
         k.locations.append(
             UnhnLocation(
                 page=d["location"]["page"], character=d["location"]["character"]
@@ -275,11 +278,14 @@ def import_char(
         c.kCheungBauerIndex.append(k)
 
     if "kFennIndex" in char:
-        d = char["kFennIndex"]
+        _kFennIndex = char["kFennIndex"]
         k = kFennIndex()
+        assert isinstance(_kFennIndex, dict)
+        assert isinstance(_kFennIndex["location"], dict)
         k.locations.append(
             UnhnLocation(
-                page=d["location"]["page"], character=d["location"]["character"]
+                page=_kFennIndex["location"]["page"],
+                character=_kFennIndex["location"]["character"],
             )
         )
         c.kFennIndex.append(k)