diff --git a/tools/isledecomp/isledecomp/compare/core.py b/tools/isledecomp/isledecomp/compare/core.py
index 3a00bea4..d602af69 100644
--- a/tools/isledecomp/isledecomp/compare/core.py
+++ b/tools/isledecomp/isledecomp/compare/core.py
@@ -266,6 +266,9 @@ def _match_imports(self):
         # the connection between the thunk functions.
         # We already have the symbol name we need from the PDB.
         for orig, recomp in orig_to_recomp.items():
+            if orig is None or recomp is None:
+                continue
+
             # Match the __imp__ symbol
             self._db.set_pair(orig, recomp, SymbolType.POINTER)